feat: implement dynamic theme palette selection

- Introduced a new feature allowing users to select from multiple accent color palettes for buttons, cards, and chat bubbles.
- Added `AppThemePalette` provider to manage the current theme palette and persist user selections.
- Updated the `AppTheme` class to utilize the selected palette for light and dark themes, enhancing visual customization.
- Enhanced the `AppCustomizationPage` to include a palette selector, improving user experience and personalization options.
- Updated localization files to support new palette selection UI elements in multiple languages.

lib/features/chat/views/chat_page.dart

@@ -946,8 +946,7 @@ class _ChatPageState extends ConsumerState<ChatPage> {
     final greetingName = deriveUserDisplayName(user);
     return LayoutBuilder(
       builder: (context, constraints) {
-        return SingleChildScrollView(
-          physics: const AlwaysScrollableScrollPhysics(),
+        return Padding(
           padding: const EdgeInsets.all(Spacing.lg),
           child: ConstrainedBox(
             constraints: BoxConstraints(minHeight: constraints.maxHeight),

lib/features/chat/widgets/assistant_message_widget.dart

@@ -115,6 +115,15 @@ class _AssistantMessageWidgetState extends ConsumerState<AssistantMessageWidget>
       _updateTypingIndicatorGate();
     }
 
+    // Update typing indicator gate when message properties that affect emptiness change
+    if (oldWidget.message.statusHistory != widget.message.statusHistory ||
+        oldWidget.message.files != widget.message.files ||
+        oldWidget.message.attachmentIds != widget.message.attachmentIds ||
+        oldWidget.message.followUps != widget.message.followUps ||
+        oldWidget.message.codeExecutions != widget.message.codeExecutions) {
+      _updateTypingIndicatorGate();
+    }
+
     // Rebuild cached avatar if model name or icon changes
     if (oldWidget.modelName != widget.modelName ||
         oldWidget.modelIconUrl != widget.modelIconUrl) {
@@ -505,7 +514,17 @@ class _AssistantMessageWidgetState extends ConsumerState<AssistantMessageWidget>
     }
 
     final hasCodeExecutions = widget.message.codeExecutions.isNotEmpty;
-    return !hasCodeExecutions;
+    if (hasCodeExecutions) {
+      return false;
+    }
+
+    // Check for tool calls in the content using ToolCallsParser
+    final hasToolCalls =
+        ToolCallsParser.segments(
+          content,
+        )?.any((segment) => segment.isToolCall) ??
+        false;
+    return !hasToolCalls;
   }
 
   void _buildCachedAvatar() {