feat: implement ProjectTasksList component and update ProjectTasksPage to use it

feat: add date_completed column to project_tasks table in database initialization
feat: update project task status to set date_completed when marking as completed

src/lib/init-db.js

@@ -145,7 +145,6 @@ export default function initializeDatabase() {
 	} catch (e) {
 		// Column already exists, ignore error
 	}
-
 	// Migration: Add is_system column to notes table
 	try {
 		db.exec(`
@@ -154,4 +153,13 @@ export default function initializeDatabase() {
 	} catch (e) {
 		// Column already exists, ignore error
 	}
+
+	// Migration: Add date_completed column to project_tasks table
+	try {
+		db.exec(`
+      ALTER TABLE project_tasks ADD COLUMN date_completed TEXT;
+    `);
+	} catch (e) {
+		// Column already exists, ignore error
+	}
 }