feat(tasks): migrate task store from localStorage to SQLite backend

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/components/WipTaskList.svelte

@@ -1,5 +1,6 @@
 <script>
-  import { tasks, addTask, completeTask, uncompleteTask, deleteTask } from '$lib/stores/page.svelte.js';
+  import { getTasks, createTask, completeTask, deleteTask } from '$lib/stores/tasks.svelte.js';
+  const tasks = getTasks();
   import { ChevronDown } from 'lucide-svelte';
 
   let { wipLimit = 3 } = $props();
@@ -12,10 +13,10 @@
   let overflowTasks = $derived(activeTasks.slice(wipLimit));
   let hasOverflow = $derived(overflowTasks.length > 0);
 
-  function handleAdd() {
+  async function handleAdd() {
     const text = newTaskText.trim();
     if (!text) return;
-    addTask({ text, bucket: 'inbox' });
+    await createTask(text, { bucket: 'inbox' });
     newTaskText = '';
   }