feat: add speech_to_text, optimize navigation transitions, improve bottom nav rebuild performance, and fix home screen padding.

lib/core/widgets/app_bottom_nav_bar.dart

@@ -82,8 +82,11 @@ class AppBottomNavBar extends ConsumerWidget {
               Builder(builder: (context) {
                 final authState = ref.watch(authProvider);
                 final isAuth = authState.status == AuthStatus.authenticated;
+                // Only watch the unreadCount field — not the entire messaging
+                // state. This prevents the nav bar from rebuilding on every
+                // typing event, new message, or status change.
                 final msgUnread = isAuth
-                    ? ref.watch(messagingProvider).unreadCount
+                    ? ref.watch(messagingProvider.select((s) => s.unreadCount))
                     : 0;
                 return _NavItem(
                   svgPath: 'assets/icons/nav_messages_icon.svg',