feat(KIN-012): UI auto/review mode toggle, autopilot indicator, persist project mode in DB

- TaskDetail: hide Approve/Reject buttons in auto mode, show "Автопилот активен" badge
- TaskDetail: execution_mode persisted per-task via PATCH /api/tasks/{id}
- TaskDetail: loadMode reads DB value, falls back to localStorage per project
- TaskDetail: back navigation preserves status filter via ?back_status query param
- ProjectView: toggleMode now persists to DB via PATCH /api/projects/{id}
- ProjectView: loadMode reads project.execution_mode from DB first
- ProjectView: task list shows 🔓 badge for auto-mode tasks
- ProjectView: status filter synced to URL query param ?status=
- api.ts: add patchProject(), execution_mode field on Project interface
- core/db.py, core/models.py: execution_mode columns + migration for projects & tasks
- web/api.py: PATCH /api/projects/{id} and PATCH /api/tasks/{id} support execution_mode
- tests: 256 tests pass, new test_auto_mode.py with 60+ auto mode tests
- frontend: vitest config added for component tests

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

core/db.py

@@ -21,6 +21,7 @@ CREATE TABLE IF NOT EXISTS projects (
     claude_md_path TEXT,
     forgejo_repo TEXT,
     language TEXT DEFAULT 'ru',
+    execution_mode TEXT NOT NULL DEFAULT 'review',
     created_at DATETIME DEFAULT CURRENT_TIMESTAMP
 );
 
@@ -39,6 +40,7 @@ CREATE TABLE IF NOT EXISTS tasks (
     test_result JSON,
     security_result JSON,
     forgejo_issue_id INTEGER,
+    execution_mode TEXT,
     created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
     updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
 );
@@ -196,10 +198,19 @@ def get_connection(db_path: Path = DB_PATH) -> sqlite3.Connection:
 def _migrate(conn: sqlite3.Connection):
     """Run migrations for existing databases."""
     # Check if language column exists on projects
-    cols = {r[1] for r in conn.execute("PRAGMA table_info(projects)").fetchall()}
-    if "language" not in cols:
+    proj_cols = {r[1] for r in conn.execute("PRAGMA table_info(projects)").fetchall()}
+    if "language" not in proj_cols:
         conn.execute("ALTER TABLE projects ADD COLUMN language TEXT DEFAULT 'ru'")
         conn.commit()
+    if "execution_mode" not in proj_cols:
+        conn.execute("ALTER TABLE projects ADD COLUMN execution_mode TEXT NOT NULL DEFAULT 'review'")
+        conn.commit()
+
+    # Check if execution_mode column exists on tasks
+    task_cols = {r[1] for r in conn.execute("PRAGMA table_info(tasks)").fetchall()}
+    if "execution_mode" not in task_cols:
+        conn.execute("ALTER TABLE tasks ADD COLUMN execution_mode TEXT")
+        conn.commit()
 
 
 def init_db(db_path: Path = DB_PATH) -> sqlite3.Connection: