fix(tasks): enable editing goals and tasks

public/data-actions.js

@@ -19,6 +19,14 @@
       const goal = { id: `goal_${crypto.randomUUID()}`, title, description: String(description).trim().slice(0, 240), targetDate, showOnDesktop: Boolean(targetDate && showOnDesktop), done: false, createdAt: new Date().toISOString() };
       const data = board(); data.goals.unshift(goal); persistBoard(data); return goal;
     },
+    updateGoal(id, { title, description = '', targetDate = '', showOnDesktop = false }) {
+      title = required(title, 100);
+      if (!validDate(targetDate)) throw new Error('invalidDate');
+      const data = board(), goal = data.goals.find(item => item.id === id);
+      if (!goal) throw new Error('notFound');
+      Object.assign(goal, { title, description: String(description).trim().slice(0, 240), targetDate, showOnDesktop: Boolean(targetDate && showOnDesktop), updatedAt: new Date().toISOString() });
+      persistBoard(data); return goal;
+    },
     createTask({ title, dueDate = '', goalId = '', priority = 'normal' }) {
       title = required(title, 140);
       if (!validDate(dueDate)) throw new Error('invalidDate');
@@ -28,6 +36,15 @@
       const task = { id: `task_${crypto.randomUUID()}`, title, dueDate, goalId, priority, done: false, createdAt: new Date().toISOString() };
       data.tasks.push(task); persistBoard(data); return task;
     },
+    updateTask(id, { title, dueDate = '', goalId = '', priority = 'normal' }) {
+      title = required(title, 140);
+      if (!validDate(dueDate)) throw new Error('invalidDate');
+      if (!['normal', 'high', 'low'].includes(priority)) throw new Error('invalidPriority');
+      const data = board(), task = data.tasks.find(item => item.id === id);
+      if (!task || (goalId && !data.goals.some(goal => goal.id === goalId))) throw new Error('notFound');
+      Object.assign(task, { title, dueDate, goalId, priority, updatedAt: new Date().toISOString() });
+      persistBoard(data); return task;
+    },
     setTaskDone(id, done) {
       const data = board(), task = data.tasks.find(item => item.id === id);
       if (!task) throw new Error('notFound');