refactor: enhance TimerPage layout and functionality; update theme and tokens for improved design consistency

- Refactored TimerPage component to improve layout and user experience.
- Updated theme configuration to utilize design tokens for better maintainability.
- Introduced new tokens for colors and typography to align with design principles.
- Simplified state management and improved timer functionality.
- Enhanced accessibility and responsiveness of UI elements.

backend/tests/test_telegram_bot.py

@@ -28,25 +28,19 @@ def test_stop_without_a_timer_explains_itself(session):
     assert "No interval is running" in telegram_bot.handle_text("/stop")
 
 
-def test_today_numbers_tasks_and_done_closes_them(session):
+def test_today_lists_and_numbers_the_tasks(session):
     settings_service.load_settings(session)
-    first = tasks_service.create_local_task(session, title="Alpha task")
+    tasks_service.create_local_task(session, title="Alpha task")
     tasks_service.create_local_task(session, title="Beta task")
 
     listing = telegram_bot.handle_text("/today")
     assert "Alpha task" in listing and "<b>1.</b>" in listing
 
-    reply = telegram_bot.handle_text("/done 1")
-    assert "Alpha task" in reply
-    session.expire_all()
-    assert session.get(type(first), first.id).is_done is True
 
-    assert "No task with that number" in telegram_bot.handle_text("/done 99")
-
-
-def test_done_without_a_listing_asks_for_one(session):
-    telegram_bot._INDEX.clear()
-    assert "/today" in telegram_bot.handle_text("/done 1")
+def test_there_is_no_done_command(session):
+    """Tasks are closed in their own tool; the bot must not pretend otherwise."""
+    assert telegram_bot.handle_text("/done 1") is None
+    assert "/done" not in telegram_bot.handle_text("/help")
 
 
 def test_report_and_streak_render(session):