fix: add navigation links and account screen

- Fix empty onPressed handlers in login/home screens
- Add todo/calendar toggle navigation in bottom dock
- Fix message invite detail path (/messages/invites/:id)
- Add account screen with logout/switch account dialogs
- Add /settings/account route

apps/lib/features/calendar/ui/screens/calendar_dayweek_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
 import 'package:lucide_icons/lucide_icons.dart';
 import '../../../../core/theme/design_tokens.dart';
 import '../widgets/bottom_dock.dart';
@@ -288,7 +289,7 @@ class _CalendarDayWeekScreenState extends State<CalendarDayWeekScreen> {
   Widget _buildBottomDock() {
     return BottomDock(
       activeTab: DockTab.calendar,
-      onTodoTap: () {},
+      onTodoTap: () => context.push('/todo'),
       onCalendarTap: () {},
       onHomeTap: () => Navigator.of(context).pop(),
     );

apps/lib/features/calendar/ui/screens/calendar_month_screen.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/cupertino.dart';
+import 'package:go_router/go_router.dart';
 import 'package:lucide_icons/lucide_icons.dart';
 import '../../../../core/theme/design_tokens.dart';
 import '../widgets/bottom_dock.dart';
@@ -350,7 +351,7 @@ class _CalendarMonthScreenState extends State<CalendarMonthScreen> {
   Widget _buildBottomDock() {
     return BottomDock(
       activeTab: DockTab.calendar,
-      onTodoTap: () {},
+      onTodoTap: () => context.push('/todo'),
       onCalendarTap: () {},
       onHomeTap: () => Navigator.of(context).pop(),
     );