diff --git a/package.json b/package.json
index 4efc034..732d0b4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "life-os",
-  "version": "1.5.3",
+  "version": "1.5.4",
   "private": true,
   "type": "module",
   "scripts": {
diff --git a/public/addons.js b/public/addons.js
index 5bc3ab5..d309e97 100644
--- a/public/addons.js
+++ b/public/addons.js
@@ -3,7 +3,7 @@
   const DRAFT_KEY = 'lifeos_today_draft_v1';
   const localDay = () => { const d = new Date(); return `${d.getFullYear()}-${String(d.getMonth()+1).padStart(2,'0')}-${String(d.getDate()).padStart(2,'0')}`; };
   const escapeHtml = value => String(value || '').replace(/[&<>]/g, char => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[char]));
-  const APP_VERSION = '1.5.3';
+  const APP_VERSION = '1.5.4';
   window.LifeOSVersion = APP_VERSION;
   const appIds = ['today', 'timeline', 'museum', 'insights', 'profile', 'tasks', 'calendar', 'system'];
   const t = (key, values) => LifeI18n.t(key, values);
diff --git a/public/i18n-renderers.js b/public/i18n-renderers.js
index ddbc66e..1ceca53 100644
--- a/public/i18n-renderers.js
+++ b/public/i18n-renderers.js
@@ -22,11 +22,6 @@
   window.closeModal = () => { rootModal().innerHTML = ''; };
   window.applyLanguage = () => { document.documentElement.lang = lang() === 'zh' ? 'zh-CN' : 'en'; document.title = t('shell.pageTitle'); const brand = document.querySelector('#desktop-brand'), launcher = document.querySelector('#life-launcher'), boot = document.querySelector('#boot span'); if (brand) brand.textContent = t('shell.brand'); if (launcher) launcher.textContent = t('shell.life'); if (boot) boot.textContent = t('shell.initializing'); if (settings().wallpaper) applyWallpaper(settings().wallpaper); };
   window.applyWallpaper = wallpaper => { if (!wallpaper?.url) return; const desktop = document.querySelector('#desktop'); desktop.style.backgroundImage = `linear-gradient(120deg,color-mix(in srgb,var(--bg) 68%,transparent),color-mix(in srgb,var(--bg) 36%,transparent)),url('${wallpaper.url}')`; desktop.style.backgroundSize = 'cover'; desktop.style.backgroundPosition = 'center'; desktop.title = t('shell.wallpaperTitle', { title: wallpaper.title || t('wallpaper.dailyImage') }); };
-  window.setLanguage = value => {
-    const state = settings(); if (!['auto','en','zh'].includes(value)) return; state.language = value; state.languageMode = value === 'auto' ? 'auto' : 'manual'; save('lifeos_settings', state);
-    window.renderIcons(); window.renderAll(); window.applyLanguage();
-    window.toast(value === 'auto' ? t(lang() === 'zh' ? 'feedback.followingZh' : 'feedback.followingEn') : t(value === 'zh' ? 'feedback.languageZh' : 'feedback.languageEn'));
-  };
   window.today = container => {
     const entryDate = todayTargetDate || day(), memory = mems().find(item => item.date === entryDate);
     if (todayDraft === null) { selectedMood = memory?.mood || 'cloudy'; selectedEnergy = memory?.energy || 3; }
@@ -77,8 +72,8 @@
   };
   window.saveProfile = () => { save('lifeos_profile', { name: pname.value, birthday: pbday.value, startDate: pstart.value || day(), motto: pmotto.value }); renderAll(); toast(t('profile.saved')); };
   window.systemApp = container => {
-    const state = settings(), bytes = new Blob([JSON.stringify({ mems: mems(), museum: museum(), profile: profile(), system: sys() })]).size, oldBackup = state.lastBackup && Date.now() - new Date(state.lastBackup) > 12096e5, detected = browserLanguage() === 'zh' ? t('system.detectedZh') : t('system.detectedEn');
-    container.innerHTML = `<div class="eyebrow">${t('system.eyebrow')}</div><h1>${t('system.title')}</h1><div class="settings"><section><div class="eyebrow">${t('system.appearance')}</div><div class="choices">${['dark','light','auto'].map(item => `<button class="chip ${state.theme === item ? 'selected' : ''}" onclick="theme('${item}')">${t(`system.theme.${item}`)}</button>`).join('')}</div></section><section><div class="eyebrow">${t('system.language')}</div><p class="sub">${detected}</p><div class="choices"><button class="chip ${state.languageMode !== 'manual' ? 'selected' : ''}" onclick="window.setLanguage('auto')">${t('system.auto')}</button><button class="chip ${state.languageMode === 'manual' && state.language === 'en' ? 'selected' : ''}" onclick="window.setLanguage('en')">${t('system.languageEnglish')}</button><button class="chip ${state.languageMode === 'manual' && state.language === 'zh' ? 'selected' : ''}" onclick="window.setLanguage('zh')">${t('system.languageChinese')}</button></div></section><section><div class="eyebrow">${t('system.data')}</div><div class="actions"><button class="primary" onclick="exportData()">${t('system.export')}</button><button class="secondary" onclick="document.querySelector('#importer').click()">${t('system.import')}</button><button class="danger" onclick="resetConfirm()">${t('system.reset')}</button><input id="importer" class="hidden" type="file" accept=".json" onchange="readImport(this)"></div></section><section><div class="eyebrow">${t('system.storage')}</div><p>${t('system.local')}<br>${t('system.storageSummary',{memories:LifeI18n.number(mems().length),museum:LifeI18n.number(museum().length),tasks:LifeI18n.number(sys().tasksBoard?.tasks?.length||0),size:LifeI18n.number(Math.ceil(bytes/1024))})}</p></section><section><div class="eyebrow">${t('system.dataStorage')}</div><p>${t('system.stored')}<br>${t('system.backups')}</p><p>${t('system.lastBackup',{value:state.lastBackup ? short(state.lastBackup.slice(0,10)) : t('common.never')})}${oldBackup ? `<br><b style="color:var(--accent)">${t('system.recommended')}</b>` : ''}</p></section><section><div class="eyebrow">${t('system.version')}</div><p>${t('system.release',{version:window.LifeOSVersion||'1.5.3'})}</p></section></div>`;
+    const state = settings(), preference = LifeI18n.preference(), bytes = new Blob([JSON.stringify({ mems: mems(), museum: museum(), profile: profile(), system: sys() })]).size, oldBackup = state.lastBackup && Date.now() - new Date(state.lastBackup) > 12096e5, detected = browserLanguage() === 'zh' ? t('system.detectedZh') : t('system.detectedEn');
+    container.innerHTML = `<div class="eyebrow">${t('system.eyebrow')}</div><h1>${t('system.title')}</h1><div class="settings"><section><div class="eyebrow">${t('system.appearance')}</div><div class="choices">${['dark','light','auto'].map(item => `<button class="chip ${state.theme === item ? 'selected' : ''}" onclick="theme('${item}')">${t(`system.theme.${item}`)}</button>`).join('')}</div></section><section><div class="eyebrow">${t('system.language')}</div><p class="sub">${detected}</p><div class="choices"><button class="chip ${preference === 'auto' ? 'selected' : ''}" onclick="window.setLanguage('auto')">${t('system.auto')}</button><button class="chip ${preference === 'en' ? 'selected' : ''}" onclick="window.setLanguage('en')">${t('system.languageEnglish')}</button><button class="chip ${preference === 'zh' ? 'selected' : ''}" onclick="window.setLanguage('zh')">${t('system.languageChinese')}</button></div></section><section><div class="eyebrow">${t('system.data')}</div><div class="actions"><button class="primary" onclick="exportData()">${t('system.export')}</button><button class="secondary" onclick="document.querySelector('#importer').click()">${t('system.import')}</button><button class="danger" onclick="resetConfirm()">${t('system.reset')}</button><input id="importer" class="hidden" type="file" accept=".json" onchange="readImport(this)"></div></section><section><div class="eyebrow">${t('system.storage')}</div><p>${t('system.local')}<br>${t('system.storageSummary',{memories:LifeI18n.number(mems().length),museum:LifeI18n.number(museum().length),tasks:LifeI18n.number(sys().tasksBoard?.tasks?.length||0),size:LifeI18n.number(Math.ceil(bytes/1024))})}</p></section><section><div class="eyebrow">${t('system.dataStorage')}</div><p>${t('system.stored')}<br>${t('system.backups')}</p><p>${t('system.lastBackup',{value:state.lastBackup ? short(state.lastBackup.slice(0,10)) : t('common.never')})}${oldBackup ? `<br><b style="color:var(--accent)">${t('system.recommended')}</b>` : ''}</p></section><section><div class="eyebrow">${t('system.version')}</div><p>${t('system.release',{version:window.LifeOSVersion||'1.5.4'})}</p></section></div>`;
   };
   window.importPreview = () => { const data = importData, board = data.system?.tasksBoard || {}; rootModal().innerHTML = `<div class="modal"><div class="modalbox"><div class="eyebrow">${t('dialog.backup')}</div><h2>${t('dialog.ready')}</h2><p class="sub">${t('dialog.exported',{date:short(data.exportedAt.slice(0,10))})}<br>${t('dialog.memories',{count:data.memories.length})}<br>${t('dialog.museumItems',{count:data.museum.length})}<br>${t('dialog.goals',{count:board.goals?.length || 0})}<br>${t('dialog.tasks',{count:board.tasks?.length || 0})}</p><div class="actions"><button class="primary" onclick="applyImport('merge')">${t('dialog.merge')}</button><button class="danger" onclick="replaceConfirm()">${t('dialog.replaceAll')}</button><button class="secondary" onclick="modal.innerHTML=''">${t('common.cancel')}</button></div></div></div>`; };
   window.replaceConfirm = () => { rootModal().innerHTML = `<div class="modal"><div class="modalbox"><div class="eyebrow">${t('dialog.final')}</div><h2>${t('dialog.replaceQuestion')}</h2><p class="sub">${t('dialog.replaceWarning')}</p><div class="actions"><button class="danger" onclick="applyImport('replace')">${t('dialog.replace')}</button><button class="secondary" onclick="importPreview()">${t('common.cancel')}</button></div></div></div>`; };
diff --git a/public/i18n.js b/public/i18n.js
index bdc1a71..cc852a0 100644
--- a/public/i18n.js
+++ b/public/i18n.js
@@ -3,20 +3,51 @@
   const dictionaries = window.LifeOSLocales || {};
   const en = dictionaries.en || {};
   const zh = dictionaries['zh-CN'] || {};
+  const PREFERENCE_KEY = 'lifeos_language_preference_v1';
+  const validPreference = value => ['auto', 'en', 'zh'].includes(value);
   const lookup = (object, path) => path.split('.').reduce((value, part) => value?.[part], object);
-  const current = () => typeof window.lang === 'function' && window.lang() === 'zh' ? 'zh' : 'en';
+  const detectBrowserLanguage = () => {
+    const preferences = navigator.languages?.length ? navigator.languages : [navigator.language || navigator.userLanguage || 'en'];
+    return preferences.some(value => String(value).toLowerCase().startsWith('zh')) ? 'zh' : 'en';
+  };
+  const readPreference = () => {
+    try {
+      const saved = localStorage.getItem(PREFERENCE_KEY);
+      if (validPreference(saved)) return saved;
+      let oldSettings = {};
+      try { oldSettings = JSON.parse(localStorage.getItem('lifeos_settings') || '{}'); } catch {}
+      const legacyMode = oldSettings.languageMode ?? (['en', 'zh'].includes(oldSettings.language) ? 'manual' : 'auto');
+      const migrated = legacyMode === 'manual' && ['en', 'zh'].includes(oldSettings.language) ? oldSettings.language : 'auto';
+      localStorage.setItem(PREFERENCE_KEY, migrated);
+      return migrated;
+    } catch { return 'auto'; }
+  };
+  let preference = readPreference();
+  const language = () => preference === 'auto' ? detectBrowserLanguage() : preference;
 
   function t(key, values = {}) {
-    const selected = current() === 'zh' ? zh : en;
+    const selected = language() === 'zh' ? zh : en;
     const template = lookup(selected, key) ?? lookup(en, key) ?? key;
     return String(template).replace(/\{(\w+)\}/g, (_, name) => values[name] ?? `{${name}}`);
   }
 
-  function locale() { return current() === 'zh' ? 'zh-CN' : 'en-US'; }
+  function locale() { return language() === 'zh' ? 'zh-CN' : 'en-US'; }
   function date(value, options) {
     const parsed = value instanceof Date ? value : new Date(typeof value === 'string' && /^\d{4}-\d{2}-\d{2}$/.test(value) ? `${value}T12:00:00` : value);
     return new Intl.DateTimeFormat(locale(), options).format(parsed);
   }
   function number(value, options) { return new Intl.NumberFormat(locale(), options).format(value); }
-  window.LifeI18n = { t, date, number, locale, dictionaries: { en, zh } };
+  function setLanguage(value) {
+    if (!validPreference(value)) return;
+    preference = value;
+    try { localStorage.setItem(PREFERENCE_KEY, value); } catch {}
+    window.renderIcons?.();
+    window.renderAll?.();
+    window.applyLanguage?.();
+    window.toast?.(value === 'auto' ? (language() === 'zh' ? 'feedback.followingZh' : 'feedback.followingEn') : (value === 'zh' ? 'feedback.languageZh' : 'feedback.languageEn'));
+  }
+
+  window.lang = language;
+  window.setLanguage = setLanguage;
+  window.LifeI18n = { t, date, number, locale, language, preference: () => preference, dictionaries: { en, zh } };
 })();
diff --git a/public/index.html b/public/index.html
index 3048162..ce9c335 100644
--- a/public/index.html
+++ b/public/index.html
@@ -10,11 +10,11 @@ document.head.insertAdjacentHTML('beforeend','<style>.window{resize:both;min-wid
 const films=[['A Quiet Tuesday','Drama · Slice of Life'],['The Afternoon That Stayed','Independent · Warm'],['Small Light, Long Hallway','Contemplative · Drama'],['Before the Notifications','Minimal · Coming of Age'],['Room With Open Curtains','Slice of Life · Calm'],['The Usual Way Home','Drama · Familiar'],['Notes Left Unfinished','Reflective · Short Film'],['A Weather of Thoughts','Quiet · Personal'],['The Day Between Things','Indie · Observational'],['Slow Hours, Soft Edges','Slice of Life · Dream'],['A Window Still Lit','Drama · Evening'],['Ordinary, Carefully Held','Human · Gentle'],['One More Page Tonight','Study · Slow Burn'],['The Space After Lunch','Memory · Calm'],['Late Bus, Clear Mind','Urban · Reflective'],['Little Things in Focus','Documentary · Life'],['What the Room Remembered','Poetic · Still'],['Blue Hour, No Rush','Evening · Quiet'],['The Map of a Small Day','Journey · Personal'],['Somewhere After Four','Indie · Warm'],['A Day With No Headline','Slice of Life · Soft'],['The Sound of Taking Time','Slow Cinema · Personal'],['Things That Did Not Need Fixing','Drama · Gentle'],['Halfway Through September','Memory · Youth'],['A Small Archive of Us','Personal · Quiet'],['The Night Kept Its Shape','Noir · Calm'],['Unscheduled Sunshine','Light · Personal'],['The Last Open Tab','Modern · Reflective'],['A Place for Today','Drama · Human'],['Nothing Lost to the Day','Slice of Life · Hopeful']];
 const lines=['Nothing remarkable happened. Maybe that was the point.','A small day, held carefully enough to remember.','The ordinary parts stayed longer than expected.','Not every chapter needs a dramatic ending.','Some thoughts arrived; some were allowed to pass.','A quiet record of being here.','The day moved at its own reasonable pace.','There was room for a little more softness.','Even the unfinished things belonged here.','The light changed, and so did the mood.','A scene worth keeping, without needing an explanation.','It was enough to notice the day as it was.','Time did not rush; neither did this memory.','The details were small, but they were real.','A pause became part of the story.','Somewhere, this became a day to keep.','The familiar became briefly luminous.','Nothing needed to be solved before nightfall.','A few moments stayed in focus.','The story was quiet, but it was still yours.','Today left a small mark.','A gentle frame around an ordinary hour.','The day asked for attention, not perfection.','This memory can rest here for now.','The world was loud; this page was not.','A few loose threads, honestly kept.','The simplest version of today was enough.','The day settled before it ended.','There was meaning in the in-between.','A private moment, safely archived.'];
 function load(k,d){try{return JSON.parse(localStorage.getItem(k))||d}catch{return d}}function save(k,v){localStorage.setItem(k,JSON.stringify(v))}function mems(){return load('lifeos_memories',[])}function museum(){return load('lifeos_museum',[])}function profile(){return load('lifeos_profile',{name:'',birthday:'',startDate:new Date().toISOString().slice(0,10),motto:''})}function settings(){return{theme:'dark',lastBackup:null,language:'auto',languageMode:'auto',...load('lifeos_settings',{})}}function sys(){let value=load('lifeos_system',{schemaVersion:2});if((Number(value.schemaVersion)||1)<2)value.schemaVersion=2;return value}
-function browserLanguage(){let ls=navigator.languages?.length?navigator.languages:[navigator.language||navigator.userLanguage||'en'];return ls.some(x=>String(x).toLowerCase().startsWith('zh'))?'zh':'en'}function lang(){let s=settings(),mode=s.languageMode??(['en','zh'].includes(s.language)?'manual':'auto');return mode==='manual'&&['en','zh'].includes(s.language)?s.language:browserLanguage()}function i18n(key,fallback=key){return fallback}
+function browserLanguage(){let ls=navigator.languages?.length?navigator.languages:[navigator.language||navigator.userLanguage||'en'];return ls.some(x=>String(x).toLowerCase().startsWith('zh'))?'zh':'en'}function lang(){return window.LifeI18n?.language()||browserLanguage()}function i18n(key,fallback=key){return fallback}
 function appName(id){return i18n(APPS[id][1])}function moodName(m){return i18n(m.toUpperCase(),cap(m))}function day(){const d=new Date();return `${d.getFullYear()}-${String(d.getMonth()+1).padStart(2,'0')}-${String(d.getDate()).padStart(2,'0')}`}function fmtDate(d){return new Date(d+'T12:00:00').toLocaleDateString(lang()==='zh'?'zh-CN':'en-US',{weekday:'long',month:'long',day:'numeric',year:'numeric'})}function shortDate(d){return new Date(d+'T12:00:00').toLocaleDateString(lang()==='zh'?'zh-CN':'en-US',lang()==='zh'?{month:'numeric',day:'numeric'}:{month:'short',day:'numeric'}).toUpperCase()}function cap(x){return x[0].toUpperCase()+x.slice(1)}function esc(s){return (s||'').replace(/[&<>]/g,x=>({'&':'&amp;','<':'&lt;','>':'&gt;'}[x]))}
 function applyWallpaper(w){if(!w?.url)return;desktop.style.backgroundImage=`linear-gradient(120deg,color-mix(in srgb,var(--bg) 68%,transparent),color-mix(in srgb,var(--bg) 36%,transparent)),url('${w.url}')`;desktop.style.backgroundSize='cover';desktop.style.backgroundPosition='center';desktop.title=LifeI18n.t('shell.wallpaperTitle',{title:w.title||LifeI18n.t('wallpaper.dailyImage')})}async function loadBingWallpaper(){let s=settings();if(s.wallpaper?.date===day()&&s.wallpaper?.source==='lifeos-proxy'){applyWallpaper(s.wallpaper);return}try{let r=await fetch('/api/bing-wallpaper'),d=await r.json();if(!r.ok||!d.url)throw Error(d.error||'No Bing image');s.wallpaper={date:day(),url:'/api/bing-wallpaper-image?date='+day(),title:d.title||'Bing daily image',source:'lifeos-proxy'};save('lifeos_settings',s);applyWallpaper(s.wallpaper)}catch(e){console.info('Bing wallpaper unavailable; using the calm fallback.',e)}}function init(){let s=settings();document.documentElement.dataset.theme=s.theme==='auto'?(matchMedia('(prefers-color-scheme:light)').matches?'light':'dark'):s.theme;renderIcons();renderTaskbar();loadBingWallpaper();setInterval(clock,1000);clock();setTimeout(applyLanguage,0);setTimeout(()=>boot.remove(),650)}
 function desktopIconClick(id,e){if(innerWidth<650){openApp(id);return}selectedIcon=id;document.querySelectorAll('.app-icon').forEach(x=>x.classList.remove('selected'));e.currentTarget.classList.add('selected')}function desktopIconKey(id,e){if(e.key==='Enter'||e.key===' '){e.preventDefault();openApp(id)}}function renderIcons(){icons.innerHTML=Object.entries(APPS).map(([id,[g,n]])=>`<button class="app-icon ${selectedIcon===id?'selected':''}" onclick="desktopIconClick('${id}',event)" ondblclick="openApp('${id}')" onkeydown="desktopIconKey('${id}',event)" oncontextmenu="showContext(event,'${id}')" title="${window.appName(id)}"><span class="glyph">${g}</span><span>${window.appName(id)}</span></button>`).join('')}function taskClick(id){let w=windows[id];if(!w){openApp(id);return}if(w.classList.contains('min')){openApp(id);return}if(activeWindow===id){minWin(id);return}focus(w)}function renderTaskbar(){let ids=innerWidth<650?Object.keys(windows):['today','timeline','museum','insights','tasks','calendar'];tasks.innerHTML=ids.map(id=>{let w=windows[id],min=w?.classList.contains('min'),fg=activeWindow===id&&!min,name=window.appName(id);return`<button class="taskapp ${w?'active running':''} ${min?'minimized':''} ${fg?'foreground':''}" title="${min?LifeI18n.t('common.restore'):name}" aria-label="${LifeI18n.t(min?'common.restore':'shell.openApp',{app:name})}" onclick="taskClick('${id}')">${APPS[id][0]}</button>`}).join('')}
-function clock(){let d=new Date();document.querySelector('#clock').textContent=d.toLocaleTimeString(LifeI18n.locale(), {hour:'2-digit',minute:'2-digit'});document.querySelector('#date').textContent=d.toLocaleDateString(lang()==='zh'?'zh-CN':'en-US',lang()==='zh'?{month:'numeric',day:'numeric'}:{month:'short',day:'numeric'}).toUpperCase()}function toggleLauncher(){launcher.classList.toggle('hidden');calendar.classList.add('hidden');launcher.innerHTML=`<div class="launchhead"><span>LIFE OS</span><span>${LifeI18n.t(`shell.${new Date().getHours()<12?'morning':new Date().getHours()<18?'afternoon':'evening'}`)}</span></div><div class="launchgrid">${Object.entries(APPS).map(([id,a])=>`<button class="launchitem" onclick="openApp('${id}');toggleLauncher()">${a[0]}<br><br>${appName(id)}</button>`).join('')}</div><div class="systemline">${LifeI18n.t('shell.systemOnline',{version:window.LifeOSVersion||'1.5.3'})}</div>`}function toggleCalendar(){calendar.classList.toggle('hidden');launcher.classList.add('hidden');calendar.innerHTML=`<div class="eyebrow">${LifeI18n.t('shell.systemDate')}</div><h2>${fmtDate(day())}</h2><p class="sub">${LifeI18n.t('shell.todaySummary',{memories:mems().length,preserved:museum().length})}</p>`}function hideContext(){document.querySelector('#life-context')?.remove()}function showContext(e,id){e.preventDefault();e.stopPropagation();hideContext();let labels={open:LifeI18n.t('shell.open'),min:LifeI18n.t('shell.minimize'),close:LifeI18n.t('shell.menuCloseWindow'),refresh:LifeI18n.t('shell.refresh'),new:LifeI18n.t('shell.newToday'),system:LifeI18n.t('shell.systemSettings')},actions=id?`<button onclick="openApp('${id}');hideContext()">${labels.open}</button>${windows[id]?`<button onclick="minWin('${id}');hideContext()">${labels.min}</button><button onclick="closeWin('${id}');hideContext()">${labels.close}</button>`:''}`:`<button onclick="renderIcons();hideContext()">${labels.refresh}</button><button onclick="openApp('today');hideContext()">${labels.new}</button><hr><button onclick="openApp('system');hideContext()">${labels.system}</button>`;let m=document.createElement('div');m.id='life-context';m.style.cssText=`position:fixed;z-index:7000;left:${Math.min(e.clientX,innerWidth-190)}px;top:${Math.min(e.clientY,innerHeight-150)}px;width:180px;padding:6px;background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow)`;m.innerHTML=actions;m.querySelectorAll('button').forEach(b=>b.style.cssText='display:block;width:100%;border:0;background:transparent;color:var(--ink);text-align:left;border-radius:6px;padding:9px 10px;font:12px Manrope');m.querySelectorAll('button').forEach(b=>b.onmouseenter=()=>b.style.background='var(--panel2)');document.body.append(m)}document.addEventListener('contextmenu',e=>{if(e.target.closest('.desktop')&&!e.target.closest('.app-icon')&&!e.target.closest('.window'))showContext(e,null)});document.addEventListener('click',hideContext)
+function clock(){let d=new Date();document.querySelector('#clock').textContent=d.toLocaleTimeString(LifeI18n.locale(), {hour:'2-digit',minute:'2-digit'});document.querySelector('#date').textContent=d.toLocaleDateString(lang()==='zh'?'zh-CN':'en-US',lang()==='zh'?{month:'numeric',day:'numeric'}:{month:'short',day:'numeric'}).toUpperCase()}function toggleLauncher(){launcher.classList.toggle('hidden');calendar.classList.add('hidden');launcher.innerHTML=`<div class="launchhead"><span>LIFE OS</span><span>${LifeI18n.t(`shell.${new Date().getHours()<12?'morning':new Date().getHours()<18?'afternoon':'evening'}`)}</span></div><div class="launchgrid">${Object.entries(APPS).map(([id,a])=>`<button class="launchitem" onclick="openApp('${id}');toggleLauncher()">${a[0]}<br><br>${appName(id)}</button>`).join('')}</div><div class="systemline">${LifeI18n.t('shell.systemOnline',{version:window.LifeOSVersion||'1.5.4'})}</div>`}function toggleCalendar(){calendar.classList.toggle('hidden');launcher.classList.add('hidden');calendar.innerHTML=`<div class="eyebrow">${LifeI18n.t('shell.systemDate')}</div><h2>${fmtDate(day())}</h2><p class="sub">${LifeI18n.t('shell.todaySummary',{memories:mems().length,preserved:museum().length})}</p>`}function hideContext(){document.querySelector('#life-context')?.remove()}function showContext(e,id){e.preventDefault();e.stopPropagation();hideContext();let labels={open:LifeI18n.t('shell.open'),min:LifeI18n.t('shell.minimize'),close:LifeI18n.t('shell.menuCloseWindow'),refresh:LifeI18n.t('shell.refresh'),new:LifeI18n.t('shell.newToday'),system:LifeI18n.t('shell.systemSettings')},actions=id?`<button onclick="openApp('${id}');hideContext()">${labels.open}</button>${windows[id]?`<button onclick="minWin('${id}');hideContext()">${labels.min}</button><button onclick="closeWin('${id}');hideContext()">${labels.close}</button>`:''}`:`<button onclick="renderIcons();hideContext()">${labels.refresh}</button><button onclick="openApp('today');hideContext()">${labels.new}</button><hr><button onclick="openApp('system');hideContext()">${labels.system}</button>`;let m=document.createElement('div');m.id='life-context';m.style.cssText=`position:fixed;z-index:7000;left:${Math.min(e.clientX,innerWidth-190)}px;top:${Math.min(e.clientY,innerHeight-150)}px;width:180px;padding:6px;background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow)`;m.innerHTML=actions;m.querySelectorAll('button').forEach(b=>b.style.cssText='display:block;width:100%;border:0;background:transparent;color:var(--ink);text-align:left;border-radius:6px;padding:9px 10px;font:12px Manrope');m.querySelectorAll('button').forEach(b=>b.onmouseenter=()=>b.style.background='var(--panel2)');document.body.append(m)}document.addEventListener('contextmenu',e=>{if(e.target.closest('.desktop')&&!e.target.closest('.app-icon')&&!e.target.closest('.window'))showContext(e,null)});document.addEventListener('click',hideContext)
 function openApp(id){launcher.classList.add('hidden');let w=windows[id];if(w){w.classList.remove('min');focus(w);return}w=document.createElement('section');w.className='window';w.dataset.id=id;w.style.left=(innerWidth<650?0:90+Object.keys(windows).length*36)+'px';w.style.top=(innerWidth<650?0:72+Object.keys(windows).length*28)+'px';w.innerHTML=`<div class="titlebar" title="${LifeI18n.t('shell.doubleClickMaximize')}"><span class="titleicon">${APPS[id][0]}</span><span class="wtitle">${appName(id)}</span><div class="controls"><button data-window-action="min" aria-label="${LifeI18n.t('shell.minimize')}">—</button><button data-window-action="max" aria-label="${LifeI18n.t('shell.maximize')}">□</button><button data-window-action="close" aria-label="${LifeI18n.t('shell.close')}">×</button></div></div><div class="content" id="content-${id}"></div>`;windows[id]=w;document.querySelector('#windows').append(w);let controls=w.querySelector('.controls'),bar=w.querySelector('.titlebar');controls.addEventListener('pointerdown',e=>{e.preventDefault();e.stopPropagation()});controls.addEventListener('click',e=>{let action=e.target.closest('button')?.dataset.windowAction;if(!action)return;e.preventDefault();e.stopPropagation();if(action==='min')minWin(id);if(action==='max')maxWin(id);if(action==='close')closeWin(id)});bar.addEventListener('dblclick',e=>{if(!e.target.closest('.controls'))maxWin(id)});w.addEventListener('pointerdown',()=>focus(w));drag(w);renderApp(id);focus(w)}function focus(w){if(!w)return;activeWindow=w.dataset.id;w.style.zIndex=++z;document.querySelectorAll('.window').forEach(x=>x.classList.toggle('active-window',x===w));renderTaskbar()}function closeWin(id){windows[id]?.remove();delete windows[id];if(activeWindow===id){activeWindow=Object.keys(windows).find(k=>!windows[k].classList.contains('min'))||null;if(activeWindow)focus(windows[activeWindow])}renderTaskbar()}function minWin(id){let w=windows[id];if(!w)return;w.classList.add('min');if(activeWindow===id){activeWindow=Object.keys(windows).find(k=>k!==id&&!windows[k].classList.contains('min'))||null;if(activeWindow)focus(windows[activeWindow])}renderTaskbar();toast(i18n('MINIMIZED — TAP THE APP ICON TO RESTORE'))}function maxWin(id){let w=windows[id];if(!w)return;w.classList.toggle('max');focus(w)}function snapWindow(w){if(innerWidth<650||w.classList.contains('max'))return;let r=w.getBoundingClientRect(),edge=22;if(r.top<edge){w.classList.add('max');return}if(r.left<edge){w.style.left='18px';w.style.top='18px';w.style.width='calc(50vw - 27px)';w.style.height='calc(100vh - 98px)'}else if(r.right>innerWidth-edge){w.style.left='calc(50vw + 9px)';w.style.top='18px';w.style.width='calc(50vw - 27px)';w.style.height='calc(100vh - 98px)'}}function drag(w){let bar=w.querySelector('.titlebar'),x,y,l,t;bar.onpointerdown=e=>{if(e.target.closest('.controls')||innerWidth<650)return;if(w.classList.contains('max'))w.classList.remove('max');x=e.clientX;y=e.clientY;l=w.offsetLeft;t=w.offsetTop;bar.setPointerCapture(e.pointerId);bar.onpointermove=e=>{w.style.left=Math.max(0,l+e.clientX-x)+'px';w.style.top=Math.max(0,t+e.clientY-y)+'px'};bar.onpointerup=()=>{bar.onpointermove=null;snapWindow(w)}}}document.addEventListener('keydown',e=>{if(e.altKey&&e.key==='F4'&&activeWindow){e.preventDefault();closeWin(activeWindow)}if(e.key==='Escape'&&activeWindow&&!document.querySelector('.modal')&&!document.querySelector('#lifeos-search')){let w=windows[activeWindow];if(w?.classList.contains('max')){e.preventDefault();maxWin(activeWindow)}}})
 function renderApp(id){let c=document.querySelector('#content-'+id);if(!c)return;if(id==='today')window.today(c);if(id==='timeline')window.timeline(c);if(id==='museum')window.museumApp(c);if(id==='insights')window.insights(c);if(id==='profile')window.profileApp(c);if(id==='tasks')window.tasksApp(c);if(id==='calendar')window.calendarApp(c);if(id==='system')window.systemApp(c);setTimeout(window.applyLanguage,0)}function renderAll(){Object.keys(windows).forEach(renderApp);renderTaskbar();window.renderDesktopGoalCountdowns?.();setTimeout(applyLanguage,0)}document.addEventListener('click',e=>{if(e.target.closest('#content-today .chip,#content-today .energy button'))setTimeout(applyLanguage,0)})
 let todayDraft=null,todayTitleDraft=null,todayTargetDate=null;function today(c){let m=mems().find(x=>x.date===day());if(todayDraft===null){selectedMood=m?.mood||'cloudy';selectedEnergy=m?.energy||3}let f=m||filmFor(selectedMood,selectedEnergy),text=todayDraft===null?(m?.text||''):todayDraft;c.innerHTML=`<div class="eyebrow">${new Date().toLocaleDateString('en-US',{weekday:'long'}).toUpperCase()}</div><h1>${fmtDate(day()).replace(/^[^,]+, /,'')}</h1><p class="sub">How was your day?</p><div class="today-grid"><div><textarea id="entry" class="entry" placeholder="Write something about today..." oninput="todayDraft=this.value">${esc(text)}</textarea><div class="actions"><button class="primary" onclick="archiveToday()">${m?'UPDATE MEMORY':'ARCHIVE TODAY'}</button><span id="saveStatus" class="status"></span></div></div><aside><div class="eyebrow">TODAY'S WEATHER</div><div class="choices">${['clear','light','cloudy','rain','storm'].map(x=>`<button class="chip ${x===selectedMood?'selected':''}" onclick="setMood('${x}')">${x.toUpperCase()}</button>`).join('')}</div><div class="eyebrow" style="margin-top:22px">ENERGY LEVEL</div><div class="energy">${[1,2,3,4,5].map(x=>`<button class="${x===selectedEnergy?'selected':''}" onclick="setEnergy(${x})">${x}</button>`).join('')}</div><div class="film"><div class="eyebrow">TODAY'S FILM</div><div class="film-title">${f.filmTitle}</div><div class="sub">${f.filmSubtitle}</div><p class="film-copy">“${f.filmLine}”</p></div></aside></div>`}function filmFor(m,e){const dict=LifeI18n.dictionaries[lang()==='zh'?'zh':'en'],seed=[...`${day()}|${m}|${e}`].reduce((sum,char,index)=>sum+char.charCodeAt(0)*(index+1),0),n=seed%dict.prompt.films.length;return{filmTitle:dict.prompt.films[n].title,filmSubtitle:dict.prompt.films[n].subtitle,filmLine:dict.prompt.lines[(n*3+e)%dict.prompt.lines.length]}}function rerenderToday(){let old=document.querySelector('#entry');todayDraft=old?old.value:todayDraft||'';window.today(document.querySelector('#content-today'));let entry=document.querySelector('#entry');entry?.focus();entry?.setSelectionRange(entry.value.length,entry.value.length)}function setMood(x){selectedMood=x;rerenderToday()}function setEnergy(x){selectedEnergy=x;rerenderToday()}function archiveToday(){let text=document.querySelector('#entry').value.trim(),a=mems(),old=a.find(x=>x.date===day()),f=old||filmFor(selectedMood,selectedEnergy),now=new Date().toISOString(),m={id:old?.id||'memory_'+crypto.randomUUID(),date:day(),text,mood:selectedMood,energy:selectedEnergy,filmTitle:f.filmTitle,filmSubtitle:f.filmSubtitle,filmLine:f.filmLine,createdAt:old?.createdAt||now,updatedAt:now};let status=document.querySelector('#saveStatus');status.textContent='ARCHIVING MEMORY...';setTimeout(()=>{save('lifeos_memories',[...a.filter(x=>x.date!==day()),m].sort((x,y)=>y.date.localeCompare(x.date)));todayDraft=null;status.textContent='MEMORY ARCHIVED';renderAll()},360)}
@@ -23,5 +23,5 @@ function museumApp(c){let a=museum(),ms=mems();c.innerHTML=`<div class="eyebrow"
 function streak(a){let s=0,d=new Date();while(a.some(m=>m.date===d.toISOString().slice(0,10))){s++;d.setDate(d.getDate()-1)}return s}function longest(a){let ds=a.map(x=>x.date).sort(),best=0,run=0,last='';ds.forEach(d=>{run=last&&((new Date(d)-new Date(last))/864e5===1)?run+1:1;best=Math.max(best,run);last=d});return best}function insights(c){let a=mems(),last=a.filter(m=>(Date.now()-new Date(m.date+'T12:00:00'))<2592e6),cnt={clear:0,light:0,cloudy:0,rain:0,storm:0};last.forEach(x=>cnt[x.mood]++);let avg=a.length?(a.reduce((s,x)=>s+x.energy,0)/a.length).toFixed(1):'—',days={};a.forEach(x=>{let d=new Date(x.date+'T12:00:00').toLocaleDateString('en-US',{weekday:'long'});days[d]=(days[d]||0)+1});let active=Object.entries(days).sort((x,y)=>y[1]-x[1])[0]?.[0]||'—';c.innerHTML=`<div class="eyebrow">LAST 30 DAYS</div><h1>Insights, quietly.</h1><div class="insights"><section class="metric"><div class="eyebrow">WEATHER</div>${Object.entries(cnt).map(([k,v])=>`<div class="sub">${cap(k)} <b style="float:right;color:var(--ink)">${v} DAYS</b></div>`).join('')}</section><section class="metric"><div class="eyebrow">AVERAGE ENERGY</div><div class="big">${avg}<span style="font-size:16px"> / 5</span></div><div class="bars">${a.slice(0,10).reverse().map(x=>`<i class="bar" style="height:${x.energy*18}%"></i>`).join('')||'<span class="sub">No entries yet</span>'}</div></section><section class="metric"><div class="eyebrow">MOST ACTIVE DAY</div><div class="big" style="font-size:26px">${active}</div></section><section class="metric"><div class="eyebrow">CURRENT STREAK</div><div class="big">${streak(a)}<span style="font-size:16px"> DAYS</span></div><div class="sub">Longest streak: ${longest(a)} days</div></section></div>`}
 function profileApp(c){let p=profile(),a=mems(),common=Object.entries(a.reduce((o,m)=>(o[m.mood]=(o[m.mood]||0)+1,o),{})).sort((x,y)=>y[1]-x[1])[0]?.[0]||'—',avg=a.length?(a.reduce((x,m)=>x+m.energy,0)/a.length).toFixed(1):'—',started=Math.max(1,Math.floor((Date.now()-new Date(p.startDate))/864e5));c.innerHTML=`<div class="eyebrow">SYSTEM PROFILE</div><h1>${p.name?esc(p.name)+' · ':''}LIFE OS ONLINE</h1><div class="profile-grid"><div class="stat"><b>${started}</b><span>DAYS ONLINE</span></div><div class="stat"><b>${a.length}</b><span>MEMORIES</span></div><div class="stat"><b>${museum().length}</b><span>MUSEUM ITEMS</span></div><div class="stat"><b>${streak(a)}</b><span>CURRENT STREAK</span></div><div class="stat"><b>${longest(a)}</b><span>LONGEST STREAK</span></div><div class="stat"><b>${cap(common)}</b><span>COMMON WEATHER</span></div></div><div class="eyebrow">PERSONAL SYSTEM</div><div class="formrow"><label>Display Name</label><input id="pname" value="${esc(p.name)}"></div><div class="formrow"><label>Birthday (optional)</label><input id="pbday" type="date" value="${esc(p.birthday)}"></div><div class="formrow"><label>Life OS Start Date</label><input id="pstart" type="date" value="${esc(p.startDate)}"></div><div class="formrow"><label>Personal Motto</label><input id="pmotto" value="${esc(p.motto)}"></div><div class="actions"><button class="primary" onclick="saveProfile()">SAVE PROFILE</button><span class="status">AVERAGE ENERGY ${avg} / 5</span></div>`}function saveProfile(){save('lifeos_profile',{name:pname.value,birthday:pbday.value,startDate:pstart.value||day(),motto:pmotto.value});renderAll();toast('PROFILE SAVED')}
 function today(c){let m=mems().find(x=>x.date===day());if(todayDraft===null){selectedMood=m?.mood||'cloudy';selectedEnergy=m?.energy||3}let f=m||filmFor(selectedMood,selectedEnergy),text=todayDraft===null?(m?.text||''):todayDraft,cWeek=new Date().toLocaleDateString(lang()==='zh'?'zh-CN':'en-US',{weekday:'long'}).toUpperCase();c.innerHTML=`<div class="eyebrow">${cWeek}</div><h1>${fmtDate(day()).replace(/^[^,]+, /,'')}</h1><p class="sub">${i18n('How was your day?')}</p><div class="today-grid"><div><textarea id="entry" class="entry" placeholder="${i18n('Write something about today...')}" oninput="todayDraft=this.value">${esc(text)}</textarea><div class="actions"><button class="primary" onclick="archiveToday()">${i18n(m?'UPDATE MEMORY':'ARCHIVE TODAY')}</button><span id="saveStatus" class="status"></span></div></div><aside><div class="eyebrow">${i18n("TODAY'S WEATHER")}</div><div class="choices">${['clear','light','cloudy','rain','storm'].map(x=>`<button class="chip ${x===selectedMood?'selected':''}" onclick="setMood('${x}')">${moodName(x)}</button>`).join('')}</div><div class="eyebrow" style="margin-top:22px">${i18n('ENERGY LEVEL')}</div><div class="energy">${[1,2,3,4,5].map(x=>`<button class="${x===selectedEnergy?'selected':''}" onclick="setEnergy(${x})">${x}</button>`).join('')}</div><div class="film"><div class="eyebrow">${i18n("TODAY'S FILM")}</div><div class="film-title">${f.filmTitle}</div><div class="sub">${f.filmSubtitle}</div><p class="film-copy">“${f.filmLine}”</p></div></aside></div>`}function rerenderToday(){let old=document.querySelector('#entry');todayDraft=old?old.value:todayDraft||'';window.today(document.querySelector('#content-today'));let entry=document.querySelector('#entry');entry?.focus();entry?.setSelectionRange(entry.value.length,entry.value.length)}
-function systemApp(c){let s=settings(),bytes=new Blob([JSON.stringify({mems:mems(),museum:museum(),profile:profile()})]).size;let rec=s.lastBackup&&(Date.now()-new Date(s.lastBackup)>12096e5);c.innerHTML=`<div class="eyebrow">SYSTEM SETTINGS</div><h1>System, local and yours.</h1><div class="settings"><section><div class="eyebrow">APPEARANCE</div><div class="choices">${['dark','light','auto'].map(x=>`<button class="chip ${s.theme===x?'selected':''}" onclick="theme('${x}')">${x.toUpperCase()}</button>`).join('')}</div></section><section><div class="eyebrow">LANGUAGE</div><div class="choices"><button class="chip ${s.language!=='zh'?'selected':''}" onclick="setLanguage('en')">ENGLISH</button><button class="chip ${s.language==='zh'?'selected':''}" onclick="setLanguage('zh')">CHINESE</button></div></section><section><div class="eyebrow">DATA</div><div class="actions"><button class="primary" onclick="exportData()">EXPORT DATA</button><button class="secondary" onclick="document.querySelector('#importer').click()">IMPORT DATA</button><button class="danger" onclick="resetConfirm()">RESET LIFE OS</button><input id="importer" class="hidden" type="file" accept=".json" onchange="readImport(this)"></div></section><section><div class="eyebrow">STORAGE</div><p>Local Storage<br>${mems().length} memories · ${museum().length} museum items · Approx. ${Math.ceil(bytes/1024)} KB</p></section><section><div class="eyebrow">DATA STORAGE</div><p>Your data is stored locally in this browser.<br>Create regular backups to prevent data loss.</p><p>${s.lastBackup?'LAST BACKUP · '+fmtDate(s.lastBackup.slice(0,10)):'LAST BACKUP · NEVER'} ${rec?'<br><b style="color:var(--accent)">BACKUP RECOMMENDED</b>':''}</p></section><section><div class="eyebrow">VERSION</div><p>Life OS<br>Version ${window.LifeOSVersion||'1.5.3'} · Schema v2</p></section></div>`}function theme(x){let s=settings();s.theme=x;save('lifeos_settings',s);init();renderAll()}function exportData(){let data={app:'Life OS',version:window.LifeOSVersion||'1.5.3',schemaVersion:1,exportedAt:new Date().toISOString(),profile:profile(),memories:mems(),museum:museum(),settings:settings()};let a=document.createElement('a');a.href=URL.createObjectURL(new Blob([JSON.stringify(data,null,2)],{type:'application/json'}));a.download='life-os-backup-'+day()+'.json';a.click();let s=settings();s.lastBackup=new Date().toISOString();save('lifeos_settings',s);renderAll();toast('BACKUP CREATED')}function readImport(el){let f=el.files[0];if(!f)return;let r=new FileReader;r.onload=()=>{try{let d=JSON.parse(r.result);if(d.app!=='Life OS'||![1,2].includes(d.schemaVersion)||!Array.isArray(d.memories)||!Array.isArray(d.museum))throw 0;importData=d;importPreview()}catch{toast('INVALID BACKUP FILE')}};r.readAsText(f)}function importPreview(){let d=importData;modal.innerHTML=`<div class="modal"><div class="modalbox"><div class="eyebrow">LIFE OS BACKUP</div><h2>Ready to restore</h2><p class="sub">Exported: ${fmtDate(d.exportedAt.slice(0,10))}<br>Memories: ${d.memories.length}<br>Museum Items: ${d.museum.length}</p><div class="actions"><button class="primary" onclick="applyImport('merge')">MERGE</button><button class="danger" onclick="replaceConfirm()">REPLACE ALL DATA</button><button class="secondary" onclick="modal.innerHTML=''">CANCEL</button></div></div></div>`}function replaceConfirm(){modal.innerHTML=`<div class="modal"><div class="modalbox"><div class="eyebrow">FINAL CONFIRMATION</div><h2>Replace all Life OS data?</h2><p class="sub">This will replace all current Life OS data.</p><div class="actions"><button class="danger" onclick="applyImport('replace')">REPLACE DATA</button><button class="secondary" onclick="importPreview()">CANCEL</button></div></div></div>`}function applyImport(mode){let d=importData;if(mode==='replace'){save('lifeos_memories',d.memories);save('lifeos_museum',d.museum);save('lifeos_profile',d.profile||{});save('lifeos_settings',d.settings||{})}else{let a=mems(), ids=new Set(a.map(x=>x.id)),dates=new Set(a.map(x=>x.date));save('lifeos_memories',[...a,...d.memories.filter(x=>!ids.has(x.id)&&!dates.has(x.date))]);let mu=museum(),mi=new Set(mu.map(x=>x.id));save('lifeos_museum',[...mu,...d.museum.filter(x=>!mi.has(x.id))])}modal.innerHTML='';toast('RESTORING SYSTEM...');setTimeout(()=>{renderAll();toast('SYSTEM RESTORED')},500)}function resetConfirm(){modal.innerHTML=`<div class="modal"><div class="modalbox"><div class="eyebrow">RESET LIFE OS</div><h2>Reset all local data?</h2><p class="sub">Export a backup first if you want to keep it.</p><div class="actions"><button class="danger" onclick="['lifeos_memories','lifeos_museum','lifeos_profile','lifeos_settings','lifeos_system'].forEach(k=>localStorage.removeItem(k));location.reload()">RESET DATA</button><button class="secondary" onclick="modal.innerHTML=''">CANCEL</button></div></div></div>`}function toast(t){let x=document.createElement('div');x.className='toast';x.textContent=t;document.body.append(x);setTimeout(()=>x.remove(),2000)}
-</script><script src="boot-guard.js"></script><script src="locales/en.js?v=1.5.3"></script><script src="locales/zh-CN.js?v=1.5.3"></script><script src="i18n.js?v=1.5.3"></script><script src="tasks.js"></script><script src="calendar.js"></script><script src="addons.js"></script><script src="i18n-renderers.js?v=1.5.3"></script><script>window.LifeOSVersion=window.LifeOSVersion||'1.5.3';window.init();if('serviceWorker' in navigator){window.addEventListener('load',()=>navigator.serviceWorker.register('/service-worker.js').catch(()=>{}))}</script></body></html>
+function systemApp(c){let s=settings(),bytes=new Blob([JSON.stringify({mems:mems(),museum:museum(),profile:profile()})]).size;let rec=s.lastBackup&&(Date.now()-new Date(s.lastBackup)>12096e5);c.innerHTML=`<div class="eyebrow">SYSTEM SETTINGS</div><h1>System, local and yours.</h1><div class="settings"><section><div class="eyebrow">APPEARANCE</div><div class="choices">${['dark','light','auto'].map(x=>`<button class="chip ${s.theme===x?'selected':''}" onclick="theme('${x}')">${x.toUpperCase()}</button>`).join('')}</div></section><section><div class="eyebrow">LANGUAGE</div><div class="choices"><button class="chip ${s.language!=='zh'?'selected':''}" onclick="setLanguage('en')">ENGLISH</button><button class="chip ${s.language==='zh'?'selected':''}" onclick="setLanguage('zh')">CHINESE</button></div></section><section><div class="eyebrow">DATA</div><div class="actions"><button class="primary" onclick="exportData()">EXPORT DATA</button><button class="secondary" onclick="document.querySelector('#importer').click()">IMPORT DATA</button><button class="danger" onclick="resetConfirm()">RESET LIFE OS</button><input id="importer" class="hidden" type="file" accept=".json" onchange="readImport(this)"></div></section><section><div class="eyebrow">STORAGE</div><p>Local Storage<br>${mems().length} memories · ${museum().length} museum items · Approx. ${Math.ceil(bytes/1024)} KB</p></section><section><div class="eyebrow">DATA STORAGE</div><p>Your data is stored locally in this browser.<br>Create regular backups to prevent data loss.</p><p>${s.lastBackup?'LAST BACKUP · '+fmtDate(s.lastBackup.slice(0,10)):'LAST BACKUP · NEVER'} ${rec?'<br><b style="color:var(--accent)">BACKUP RECOMMENDED</b>':''}</p></section><section><div class="eyebrow">VERSION</div><p>Life OS<br>Version ${window.LifeOSVersion||'1.5.4'} · Schema v2</p></section></div>`}function theme(x){let s=settings();s.theme=x;save('lifeos_settings',s);init();renderAll()}function exportData(){let data={app:'Life OS',version:window.LifeOSVersion||'1.5.4',schemaVersion:1,exportedAt:new Date().toISOString(),profile:profile(),memories:mems(),museum:museum(),settings:settings()};let a=document.createElement('a');a.href=URL.createObjectURL(new Blob([JSON.stringify(data,null,2)],{type:'application/json'}));a.download='life-os-backup-'+day()+'.json';a.click();let s=settings();s.lastBackup=new Date().toISOString();save('lifeos_settings',s);renderAll();toast('BACKUP CREATED')}function readImport(el){let f=el.files[0];if(!f)return;let r=new FileReader;r.onload=()=>{try{let d=JSON.parse(r.result);if(d.app!=='Life OS'||![1,2].includes(d.schemaVersion)||!Array.isArray(d.memories)||!Array.isArray(d.museum))throw 0;importData=d;importPreview()}catch{toast('INVALID BACKUP FILE')}};r.readAsText(f)}function importPreview(){let d=importData;modal.innerHTML=`<div class="modal"><div class="modalbox"><div class="eyebrow">LIFE OS BACKUP</div><h2>Ready to restore</h2><p class="sub">Exported: ${fmtDate(d.exportedAt.slice(0,10))}<br>Memories: ${d.memories.length}<br>Museum Items: ${d.museum.length}</p><div class="actions"><button class="primary" onclick="applyImport('merge')">MERGE</button><button class="danger" onclick="replaceConfirm()">REPLACE ALL DATA</button><button class="secondary" onclick="modal.innerHTML=''">CANCEL</button></div></div></div>`}function replaceConfirm(){modal.innerHTML=`<div class="modal"><div class="modalbox"><div class="eyebrow">FINAL CONFIRMATION</div><h2>Replace all Life OS data?</h2><p class="sub">This will replace all current Life OS data.</p><div class="actions"><button class="danger" onclick="applyImport('replace')">REPLACE DATA</button><button class="secondary" onclick="importPreview()">CANCEL</button></div></div></div>`}function applyImport(mode){let d=importData;if(mode==='replace'){save('lifeos_memories',d.memories);save('lifeos_museum',d.museum);save('lifeos_profile',d.profile||{});save('lifeos_settings',d.settings||{})}else{let a=mems(), ids=new Set(a.map(x=>x.id)),dates=new Set(a.map(x=>x.date));save('lifeos_memories',[...a,...d.memories.filter(x=>!ids.has(x.id)&&!dates.has(x.date))]);let mu=museum(),mi=new Set(mu.map(x=>x.id));save('lifeos_museum',[...mu,...d.museum.filter(x=>!mi.has(x.id))])}modal.innerHTML='';toast('RESTORING SYSTEM...');setTimeout(()=>{renderAll();toast('SYSTEM RESTORED')},500)}function resetConfirm(){modal.innerHTML=`<div class="modal"><div class="modalbox"><div class="eyebrow">RESET LIFE OS</div><h2>Reset all local data?</h2><p class="sub">Export a backup first if you want to keep it.</p><div class="actions"><button class="danger" onclick="['lifeos_memories','lifeos_museum','lifeos_profile','lifeos_settings','lifeos_system'].forEach(k=>localStorage.removeItem(k));location.reload()">RESET DATA</button><button class="secondary" onclick="modal.innerHTML=''">CANCEL</button></div></div></div>`}function toast(t){let x=document.createElement('div');x.className='toast';x.textContent=t;document.body.append(x);setTimeout(()=>x.remove(),2000)}
+</script><script src="boot-guard.js"></script><script src="locales/en.js?v=1.5.4"></script><script src="locales/zh-CN.js?v=1.5.4"></script><script src="i18n.js?v=1.5.4"></script><script src="tasks.js"></script><script src="calendar.js"></script><script src="addons.js"></script><script src="i18n-renderers.js?v=1.5.4"></script><script>window.LifeOSVersion=window.LifeOSVersion||'1.5.4';window.init();if('serviceWorker' in navigator){window.addEventListener('load',()=>navigator.serviceWorker.register('/service-worker.js').catch(()=>{}))}</script></body></html>
diff --git a/public/service-worker.js b/public/service-worker.js
index a75c97e..afcfee5 100644
--- a/public/service-worker.js
+++ b/public/service-worker.js
@@ -1,7 +1,7 @@
-const CACHE = 'life-os-shell-v1.5.3';
+const CACHE = 'life-os-shell-v1.5.4';
 const SHELL = [
   '/', '/index.html', '/manifest.webmanifest', '/life-os-icon.svg',
-  '/boot-guard.js', '/locales/en.js?v=1.5.3', '/locales/zh-CN.js?v=1.5.3', '/i18n.js?v=1.5.3', '/tasks.js?v=1.5.3', '/calendar.js?v=1.5.3', '/i18n-renderers.js?v=1.5.3', '/addons.js?v=1.5.3'
+  '/boot-guard.js', '/locales/en.js?v=1.5.4', '/locales/zh-CN.js?v=1.5.4', '/i18n.js?v=1.5.4', '/tasks.js?v=1.5.4', '/calendar.js?v=1.5.4', '/i18n-renderers.js?v=1.5.4', '/addons.js?v=1.5.4'
 ];
 
 self.addEventListener('install', event => {
diff --git a/scripts/build.mjs b/scripts/build.mjs
index 1cce370..cecb138 100644
--- a/scripts/build.mjs
+++ b/scripts/build.mjs
@@ -8,7 +8,7 @@ const meta = new URL("../dist/.openai/", import.meta.url);
 await rm(dist, { recursive: true, force: true });
 await Promise.all([mkdir(server, { recursive: true }), mkdir(meta, { recursive: true })]);
 const [rawIndexHtml, addonsJs, bootGuardJs, i18nJs, tasksJs, calendarJs, i18nRenderersJs, manifest, serviceWorker, icon, localeEn, localeZh] = await Promise.all([text("index.html"), text("addons.js"), text("boot-guard.js"), text("i18n.js"), text("tasks.js"), text("calendar.js"), text("i18n-renderers.js"), text("manifest.webmanifest"), text("service-worker.js"), text("life-os-icon.svg"), readFile(new URL("../public/locales/en.json", import.meta.url), "utf8"), readFile(new URL("../public/locales/zh-CN.json", import.meta.url), "utf8")]);
-const release = "1.5.3";
+const release = "1.5.4";
 const indexHtml = rawIndexHtml.replace('src="addons.js"', `src="addons.js?v=${release}`).replace('src="tasks.js"', `src="tasks.js?v=${release}`).replace('src="calendar.js"', `src="calendar.js?v=${release}`);
 await writeFile(new URL("assets.js", server), `export const indexHtml=${JSON.stringify(indexHtml)};\nexport const addonsJs=${JSON.stringify(addonsJs)};\nexport const bootGuardJs=${JSON.stringify(bootGuardJs)};\nexport const i18nJs=${JSON.stringify(i18nJs)};\nexport const localeEn=JSON.parse(${JSON.stringify(localeEn)});\nexport const localeZh=JSON.parse(${JSON.stringify(localeZh)});\nexport const localeEnJs=${JSON.stringify(`window.LifeOSLocales=window.LifeOSLocales||{};window.LifeOSLocales.en=${localeEn};`)};\nexport const localeZhJs=${JSON.stringify(`window.LifeOSLocales=window.LifeOSLocales||{};window.LifeOSLocales['zh-CN']=${localeZh};`)};\nexport const tasksJs=${JSON.stringify(tasksJs)};\nexport const calendarJs=${JSON.stringify(calendarJs)};\nexport const i18nRenderersJs=${JSON.stringify(i18nRenderersJs)};\nexport const manifest=${JSON.stringify(manifest)};\nexport const serviceWorker=${JSON.stringify(serviceWorker)};\nexport const icon=${JSON.stringify(icon)};\n`);
 await copyFile(new URL("../worker/index.js", import.meta.url), new URL("index.js", server));
diff --git a/scripts/validate.mjs b/scripts/validate.mjs
index 8460ce2..1fa4662 100644
--- a/scripts/validate.mjs
+++ b/scripts/validate.mjs
@@ -38,22 +38,56 @@ for (const [, inlineScript] of source.matchAll(/<script>([\s\S]*?)<\/script>/g))
 assert.doesNotMatch(source, /localizeDynamicText|createTreeWalker|NodeFilter\.SHOW_TEXT|const ZH=/);
 assert.match(source, /id==='system'\)window\.systemApp\(c\)/);
 assert.match(source, /id==='today'\)window\.today\(c\)/);
-assert.match(assets.i18nRenderersJs, /window\.setLanguage = value/);
+assert.match(assets.i18nJs, /window\.setLanguage = setLanguage/);
 assert.match(assets.i18nRenderersJs, /window\.renderAll\(\)/);
 assert.doesNotMatch(source, /Version 0\.1|Schema v1/);
-const langSource = source.match(/function browserLanguage\(\).*?function i18n\(key/)[0].replace(/function i18n\(key[\s\S]*$/, "");
-let preferences = { language: "auto", languageMode: "auto" };
-const languageContext = vm.createContext({ navigator: { languages: ["zh-CN"], language: "zh-CN" }, settings: () => preferences });
-vm.runInContext(langSource, languageContext);
-assert.equal(languageContext.lang(), "zh", "auto mode follows Chinese browser language");
-languageContext.navigator.languages = ["en-US"];
-assert.equal(languageContext.lang(), "en", "auto mode follows English browser language");
-preferences = { language: "zh", languageMode: "manual" };
-assert.equal(languageContext.lang(), "zh", "manual Chinese choice overrides browser language");
-preferences = { language: "en", languageMode: "manual" };
-assert.equal(languageContext.lang(), "en", "manual English choice overrides browser language");
-preferences = { language: "zh" };
-assert.equal(languageContext.lang(), "zh", "legacy manual preference survives settings migration");
+const makeStorage = initial => {
+  const values = new Map(Object.entries(initial || {}));
+  return { getItem: key => values.get(key) ?? null, setItem: (key,value) => values.set(key,String(value)), values };
+};
+let legacySettings = { language: "auto", languageMode: "auto" };
+const calls = { icons: 0, render: 0, apply: 0, toast: 0 };
+const localStorage = makeStorage();
+const localeContext = vm.createContext({
+  navigator: { languages: ["zh-CN"], language: "zh-CN" },
+  localStorage,
+  LifeOSLocales: { en: assets.localeEn, "zh-CN": assets.localeZh },
+  settings: () => legacySettings,
+  renderIcons() { calls.icons++; }, renderAll() { calls.render++; }, applyLanguage() { calls.apply++; }, toast() { calls.toast++; },
+});
+localeContext.window = localeContext;
+vm.runInContext(assets.i18nJs, localeContext);
+assert.equal(localeContext.LifeI18n.preference(), "auto");
+assert.equal(localeContext.LifeI18n.language(), "zh", "auto mode follows Chinese browser language");
+localeContext.navigator.languages = ["en-US"];
+assert.equal(localeContext.LifeI18n.language(), "en", "auto mode follows English browser language");
+assert.equal(localeContext.LifeI18n.t("app.today"), "TODAY");
+localeContext.setLanguage("zh");
+assert.equal(localeContext.LifeI18n.language(), "zh", "manual Chinese choice overrides browser language");
+assert.equal(localeContext.LifeI18n.t("app.today"), "今日");
+assert.equal(localStorage.getItem("lifeos_language_preference_v1"), "zh");
+assert.deepEqual(calls, { icons: 1, render: 1, apply: 1, toast: 1 }, "language selection redraws the desktop and shows feedback");
+legacySettings = { language: "en", languageMode: "manual" };
+assert.equal(localeContext.LifeI18n.language(), "zh", "cloud settings cannot overwrite the local manual choice");
+localeContext.setLanguage("en");
+assert.equal(localeContext.LifeI18n.language(), "en", "manual English choice overrides browser language");
+assert.equal(localeContext.LifeI18n.t("app.today"), "TODAY");
+localeContext.navigator.languages = ["zh-CN"];
+localeContext.setLanguage("auto");
+assert.equal(localeContext.LifeI18n.preference(), "auto");
+assert.equal(localeContext.LifeI18n.language(), "zh", "auto mode ignores stale cloud preference and follows this device");
+const migratedStorage = makeStorage({ lifeos_settings: JSON.stringify({ language: "zh" }) });
+const migratedContext = vm.createContext({
+  navigator: { languages: ["en-US"] }, localStorage: migratedStorage,
+  LifeOSLocales: { en: assets.localeEn, "zh-CN": assets.localeZh },
+  settings: () => ({ language: "zh", languageMode: "manual" }),
+});
+migratedContext.window = migratedContext;
+vm.runInContext(assets.i18nJs, migratedContext);
+assert.equal(migratedContext.LifeI18n.language(), "zh", "legacy manual preference migrates to the local preference key");
+assert.match(assets.i18nRenderersJs, /preference === 'zh'/);
+assert.match(assets.i18nRenderersJs, /onclick=\"window\.setLanguage\('zh'\)\"/);
+assert.doesNotMatch(assets.addonsJs, /lifeos_language_preference_v1/, "the device locale preference stays outside cloud-synced keys");
 const zhLogin = await worker.default.fetch(new Request("https://life-os.test/", { headers: { "accept-language": "zh-CN,zh;q=0.9" } }), {});
 assert.match(await zhLogin.text(), /登录 ChatGPT/);
 const enLogin = await worker.default.fetch(new Request("https://life-os.test/", { headers: { "accept-language": "en-US,en;q=0.9" } }), {});