feat(notifications): add configurable browser reminders

public/locales/en.json

@@ -198,6 +198,23 @@
     "saved": "PROFILE SAVED",
     "average": "AVERAGE ENERGY {value} / 5"
   },
+  "notifications": {
+    "title": "NOTIFICATIONS",
+    "allow": "Allow system notifications",
+    "openOnly": "Reminders run while Life OS is open. Browsers may delay them when a tab sleeps; they cannot arrive after the site is closed.",
+    "time": "{name} time",
+    "sendTest": "Send a test notification",
+    "status": {
+      "default": "Permission has not been requested. Choose Allow to enable delivery.",
+      "granted": "System notifications are allowed on this device.",
+      "denied": "Notifications are blocked. Change this site's permission in your browser settings.",
+      "unsupported": "System notifications are unavailable in this browser or context."
+    },
+    "memory": { "label": "Today's memory", "description": "Remind me if I have not recorded a memory today.", "title": "A moment to remember", "body": "You have not written today's memory yet." },
+    "tasks": { "label": "Today's tasks", "description": "Show the number of unfinished tasks due today or earlier.", "title": "Today's tasks", "body": "{count} unfinished tasks are due today or earlier." },
+    "goals": { "label": "Goal countdown", "description": "Show the nearest active goal with a target date.", "title": "Goal countdown", "days": "{name}: {count} days left.", "today": "{name}: target date is today.", "overdue": "{name}: {count} days past the target date." },
+    "test": { "title": "Life OS notifications are ready", "body": "Your browser can show reminders from Life OS.", "failed": "Could not show the test notification." }
+  },
   "system": {
     "eyebrow": "SYSTEM SETTINGS",
     "title": "System, local and yours.",