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/app/services/telegram_bot.py

@@ -41,7 +41,6 @@ HELP_EN = """<b>Kadence</b>
 /pause · /resume — hold the clock
 /status — what is running right now
 /today — your todo list, grouped
-/done &lt;number&gt; — close task N from /today
 /report — today's report, now
 /week — the weekly review
 /streak — streak and all-time totals
@@ -56,7 +55,6 @@ HELP_RU = """<b>Kadence</b>
 /pause · /resume — пауза и продолжение
 /status — что идёт сейчас
 /today — список задач по группам
-/done &lt;номер&gt; — закрыть задачу N из /today
 /report — отчёт за сегодня
 /week — итоги недели
 /streak — серия и общая статистика
@@ -171,7 +169,7 @@ def _cmd_resume(session, settings: AppSettings, _args: str) -> str:
 
 
 def _cmd_today(session, settings: AppSettings, _args: str) -> str:
-    """The todo list, numbered so `/done 3` has something to refer to."""
+    """The todo list, grouped by deadline and numbered for reading."""
     ru = settings.notifications.report.language == "ru"
     today = local_date(settings.timezone)
     tasks = tasks_service.list_tasks(session)
@@ -180,7 +178,6 @@ def _cmd_today(session, settings: AppSettings, _args: str) -> str:
     if not ordered:
         return "✨ Задач нет." if ru else "✨ Nothing on the list."
 
-    _INDEX[settings.notifications.telegram.chat_id] = [task.id for task in ordered]
     limit = settings.notifications.report.max_tasks_listed
     lines = [f"<b>{'📋 Задачи' if ru else '📋 Your tasks'}</b>"]
     marks = {"overdue": "🔴", "today": "🟡", "upcoming": "🔵", "someday": "⚪"}
@@ -196,30 +193,9 @@ def _cmd_today(session, settings: AppSettings, _args: str) -> str:
             )
     if position > limit:
         lines.append(("… и ещё " if ru else "… and ") + f"{position - limit}")
-    lines.append("")
-    lines.append("<i>/done N</i>")
     return "\n".join(lines)
 
 
-_INDEX: dict[str, list[int]] = {}
-
-
-def _cmd_done(session, settings: AppSettings, args: str) -> str:
-    ru = settings.notifications.report.language == "ru"
-    chat_id = settings.notifications.telegram.chat_id
-    index = _INDEX.get(chat_id)
-    if not args.strip().isdigit():
-        return "Укажи номер: /done 3" if ru else "Give me a number: /done 3"
-    if not index:
-        return "Сначала /today." if ru else "Run /today first."
-    position = int(args.strip())
-    if not 1 <= position <= len(index):
-        return "Нет такого номера." if ru else "No task with that number."
-    record, warning = tasks_service.complete_task(session, settings, index[position - 1])
-    text = f"✅ {report._esc(record.title)}"
-    return text + (f"\n⚠️ {report._esc(warning)}" if warning else "")
-
-
 def _cmd_report(session, settings: AppSettings, _args: str) -> str:
     today = local_date(settings.timezone)
     _, payload = report.get_or_build_daily(session, settings, today, rebuild=True)
@@ -283,7 +259,6 @@ COMMANDS: dict[str, Callable] = {
     "resume": _cmd_resume,
     "today": _cmd_today,
     "tasks": _cmd_today,
-    "done": _cmd_done,
     "report": _cmd_report,
     "week": _cmd_week,
     "streak": _cmd_streak,