- Remove automatic insertion of "你好" placeholder message in preview payload
- Keep messages array empty when no user messages exist in conversation
- Only process image handling logic when user messages are present
- Ensure preview request body accurately reflects current conversation state
Previously, the preview panel would automatically inject a default "你好"
user message when the conversation was empty, which could be misleading.
This change ensures the preview payload shows exactly what would be sent
based on the current conversation state, improving accuracy and user
understanding of the actual API request structure.
- Add clear context button positioned on the left side of input area
- Create symmetric layout with clear button (left) and send button (right)
- Standardize both buttons to 32x32px size for consistent appearance
- Apply distinct styling: gray background for clear (red on hover), purple for send
- Add smooth transition animations for better user experience
- Align buttons vertically centered for improved visual balance
The clear conversation button provides quick access to context clearing
functionality directly from the input area, matching the design patterns
shown in Semi Design documentation and improving overall user workflow.
- Add onMessageReset reference comparison to OptimizedMessageActions memo
- Force component re-render when model selection changes
- Prevent stale closure issue in retry functionality
- Ensure first retry attempt uses newly selected model
Previously, when changing the model selection, the retry button would
still use the previous model due to React memo optimization preventing
re-renders. By comparing the onMessageReset callback reference, the
component now properly updates when the model changes, ensuring the
retry functionality immediately uses the currently selected model.
- Store editing message object reference using useRef to avoid ID conflicts
- Use object reference comparison first before falling back to ID matching
- Apply fix to both save and cancel operations in message editing
- Clear reference after edit completion to prevent stale object issues
Previously, when editing imported messages that contained duplicate IDs,
the findIndex operation would match the first occurrence rather than the
intended message, causing conversation history truncation when saving
edits. This change stores and uses object references for accurate message
identification during the editing process.
- Use object reference comparison first before falling back to ID matching
- Prevent incorrect message index lookup when duplicate IDs exist
- Apply fix to both handleMessageReset and handleMessageDelete functions
- Maintain backward compatibility with ID-based message identification
Previously, when importing messages that contained duplicate IDs, the
findIndex operation would match the first occurrence rather than the
intended message, causing history truncation on retry. This change uses
object reference comparison as the primary method, ensuring accurate
message identification and preserving conversation history.
- Extend handleMessageReset condition to include 'system' role messages
- Allow system messages to trigger regeneration like assistant messages
- Fix disabled retry button issue when message role is switched to system
- Maintain consistent user experience across different message roles
Previously, when an assistant message was switched to system role,
the retry button became non-functional. This change ensures that
system messages can be regenerated by finding the previous user
message and resending it, maintaining feature parity with assistant
messages.
- Add multi-dimensional animation with translateY, scale, and blur transforms
- Introduce 60% keyframe for smoother animation progression
- Extend animation duration from 0.4s to 0.6s for better visual impact
- Apply cubic-bezier(0.22, 1, 0.36, 1) easing for more natural motion
- Add will-change property to optimize rendering performance
- Improve perceived responsiveness during AI response streaming
The enhanced animation now provides a more polished and engaging user
experience when AI responses are being streamed, with text appearing
smoothly from bottom-up with subtle scaling and blur effects.
**Problem 1: Chat interface not refreshing when resetting imported messages**
- The "reset messages simultaneously" option during config import failed to
update the chat interface properly
- Normal conversation resets worked correctly
**Problem 2: Messages stuck in loading state after page refresh**
- When AI was generating a response and user refreshed the page, the message
remained in loading state indefinitely
- Stop button had no effect on these orphaned loading messages
**Changes Made:**
1. **Fixed config reset message refresh** (`usePlaygroundState.js`):
```javascript
// Clear messages first, then set defaults to force component re-render
setMessage([]);
setTimeout(() => {
setMessage(DEFAULT_MESSAGES);
}, 0);
```
2. **Enhanced stop generator functionality** (`useApiRequest.js`):
```javascript
// Handle orphaned loading messages even without active SSE connection
const onStopGenerator = useCallback(() => {
// Close active SSE if exists
if (sseSourceRef.current) {
sseSourceRef.current.close();
sseSourceRef.current = null;
}
// Always attempt to complete any loading/incomplete messages
// ... processing logic
}, [setMessage, applyAutoCollapseLogic, saveMessages]);
```
3. **Added automatic message state recovery** (`usePlaygroundState.js`):
```javascript
// Auto-fix loading/incomplete messages on page load
useEffect(() => {
const lastMsg = message[message.length - 1];
if (lastMsg.status === MESSAGE_STATUS.LOADING ||
lastMsg.status === MESSAGE_STATUS.INCOMPLETE) {
// Process incomplete content and mark as complete
// Save corrected message state
}
}, []);
```
**Root Cause:**
- Config reset: Direct state assignment didn't trigger component refresh
- Loading state: No recovery mechanism for interrupted SSE connections after refresh
**Impact:**
- ✅ Config reset now properly refreshes chat interface
- ✅ Stop button works on orphaned loading messages
- ✅ Page refresh automatically recovers incomplete messages
- ✅ No more permanently stuck loading states
When using the "reset messages simultaneously" option during config import,
the conversation messages in the chat interface were not being properly reset,
while normal conversation resets worked correctly.
**Changes:**
- Modified `handleConfigReset` in `usePlaygroundState.js` to clear messages
before setting default examples
- Added asynchronous message update to force Chat component re-render
- Ensures immediate UI refresh when resetting imported conversation data
**Root Cause:**
The direct assignment to DEFAULT_MESSAGES didn't trigger a complete
component refresh, causing the chat interface to display stale data.
**Solution:**
```javascript
// Before
setMessage(DEFAULT_MESSAGES);
// After
setMessage([]);
setTimeout(() => {
setMessage(DEFAULT_MESSAGES);
}, 0);
```
This two-step approach forces the Chat component to unmount and remount
with fresh data, resolving the display inconsistency.
- Modify saveMessagesImmediately to accept messages parameter
- Pass updated message list to all save calls instead of relying on closure
- Ensure complete message history is saved including the last message
- Fix timing issue where old message state was being saved
This fixes the issue where the last conversation was not being persisted to localStorage.
- Move useEffect hooks before conditional returns in MessageContent and ThinkingContent
- Ensure hooks are called in the same order every render
- Fix "Rendered fewer hooks than expected" error when API returns non-200 status
- Follow React hooks rules: only call hooks at the top level
This prevents the entire page from crashing when API requests fail.
- Refactor message saving strategy from automatic to manual saving
- Save messages only on key operations: send, complete, edit, delete, role toggle, clear
- Prevent frequent localStorage writes during streaming responses
- Remove excessive console logging
- Remove all console.log statements from save/load operations
- Clean up debug logs to reduce console noise
- Optimize initial state loading with lazy initialization
- Replace useRef with useState lazy initialization for config and messages
- Ensure loadConfig and loadMessages are called only once on mount
- Prevent redundant localStorage reads during re-renders
- Update hooks to support new save strategy
- Pass saveMessages callback through component hierarchy
- Add saveMessagesImmediately to relevant hooks (useApiRequest, useMessageActions, useMessageEdit)
- Trigger saves at appropriate lifecycle points
This significantly improves performance by reducing localStorage I/O operations
from continuous writes during streaming to discrete saves at meaningful points.
Summary
This commit addresses two critical issues affecting the real-time chat experience in the Playground:
1. Optimized re-rendering of reasoning content
• Added `reasoningContent` to the comparison function of `OptimizedMessageContent` (`web/src/components/playground/OptimizedComponents.js`).
• Ensures the component re-renders while reasoning text streams, resolving the bug where only the first characters (“好,”) were shown until the stream finished.
2. Defensive checks for SSE message updates
• Added early-return guards in `streamMessageUpdate` (`web/src/hooks/useApiRequest.js`).
• Skips updates when `lastMessage` is undefined or the last message isn’t from the assistant, preventing `TypeError: Cannot read properties of undefined (reading 'status')` during rapid SSE responses.
Impact
• Real-time reasoning content now appears progressively, enhancing user feedback.
• Eliminates runtime crashes caused by undefined message references, improving overall stability.
- Remove duplicate thinking content rendering logic from MessageContent component
- Import and utilize ThinkingContent component for consistent thinking display
- Clean up unused icon imports (ChevronRight, ChevronUp, Brain)
- Consolidate "思考中..." header text logic into single component
- Reduce code duplication by ~70 lines while maintaining all functionality
- Improve component separation of concerns and maintainability
The MessageContent component now delegates thinking content rendering to the
dedicated ThinkingContent component, eliminating the previously duplicated
UI logic and state management for thinking processes.
- Add consistent title section with gradient icon and heading
- Include close button in mobile view for better UX consistency
- Standardize mobile and desktop ConfigManager styling
- Adjust layout structure and padding for visual alignment
- Use Settings icon with purple-to-pink gradient to match design system
This change ensures both SettingsPanel and DebugPanel have identical
header layouts and interaction patterns across all screen sizes.
## Breaking Changes
- Remove backward compatibility layer for old action types
- StyleContext is no longer exported, use useStyle hook instead
## Major Improvements
- **Architecture**: Replace useState with useReducer for complex state management
- **Performance**: Add debounced resize handling and batch updates via BATCH_UPDATE action
- **DX**: Export useStyle hook and styleActions for type-safe usage
- **Memory**: Use useMemo to cache context value and prevent unnecessary re-renders
## Bug Fixes
- **UI**: Eliminate padding flicker when navigating to /console/chat* and /console/playground routes
- **Logic**: Remove redundant localStorage operations and state synchronization
## Implementation Details
- Define ACTION_TYPES and ROUTE_PATTERNS constants for better maintainability
- Add comprehensive JSDoc documentation for all functions
- Extract custom hooks: useWindowResize, useRouteChange, useMobileSiderAutoHide
- Calculate shouldInnerPadding directly in PageLayout based on pathname to prevent async updates
- Integrate localStorage saving logic into SET_SIDER_COLLAPSED reducer case
- Remove SET_INNER_PADDING action as it's no longer needed
## Updated Components
- PageLayout.js: Direct padding calculation based on route
- HeaderBar.js: Use new useStyle hook and styleActions
- SiderBar.js: Remove redundant localStorage calls
- LogsTable.js: Remove unused StyleContext import
- Playground/index.js: Migrate to new API
## Performance Impact
- Reduced component re-renders through optimized context structure
- Eliminated unnecessary effect dependencies and state updates
- Improved route transition smoothness with synchronous padding calculation
Remove the 5-image upload restriction in playground and enhance UI consistency
Changes:
- Remove 5-image limit constraint from ImageUrlInput component
- Update hint text to remove "maximum 5 images" references
- Add custom scrollbar styling for image list to match site-wide design
- Apply consistent thin scrollbar (6px width) with Semi Design color variables
- Maintain hover effects and rounded corners for better UX
Breaking Changes: None
Files modified:
- web/src/components/playground/ImageUrlInput.js
- web/src/index.css
This change allows users to upload unlimited images in playground mode while
maintaining visual consistency across the application's scrollable elements.
- Move reset settings button to the same row as the last modified timestamp
- Use flexbox layout with justify-between to align timestamp left and reset button right
- Keep export and import buttons on the separate row below
- Improve space utilization and visual hierarchy in the settings panel
This change enhances the user interface by creating a more compact and intuitive layout
for the configuration management controls in the playground component.
- Remove duplicate onRoleToggle prop passing to ChatArea component in Playground/index.js
- Move Toast notification outside setMessage callback in useMessageActions hook
- Prevent multiple event bindings that caused repeated role switch notifications
- Add early return validation for role toggle eligibility
This fixes the issue where users would see multiple success toasts when switching
between Assistant and System roles in the chat interface.
Files changed:
- web/src/pages/Playground/index.js
- web/src/hooks/useMessageActions.js
Hide y-axis scrollbars to provide a cleaner UI experience while maintaining
scroll functionality through mouse wheel and keyboard navigation.
Changes include:
- Hide scrollbars in CustomRequestEditor TextArea component
- Hide scrollbars in chat container and all related chat components
- Hide scrollbars in thinking content areas
- Add cross-browser compatibility for scrollbar hiding
- Maintain scroll functionality while improving visual aesthetics
Components affected:
- CustomRequestEditor.js: Added custom-request-textarea class
- index.css: Updated scrollbar styles for chat, thinking, and editor areas
The interface now provides a more streamlined appearance consistent with
modern UI design patterns while preserving all interactive capabilities.
Fix role toggle functionality where switching message roles (assistant/system)
did not update the UI immediately and required page refresh to see changes.
Changes:
- Add message.role comparison in OptimizedMessageContent memo function
- Add message.role comparison in OptimizedMessageActions memo function
The issue was caused by React.memo optimization that wasn't tracking role
changes, preventing re-renders when only the message role property changed.
Now role switches are reflected immediately in both message content display
and action button states.
Fixes: Role switching requires page refresh to display correctly
- Add CustomRequestEditor component with JSON validation and real-time formatting
- Implement bidirectional sync between chat messages and custom request body
- Add persistent local storage for chat messages (separate from config)
- Remove redundant System Prompt field in custom mode
- Refactor configuration storage to separate messages and settings
New Features:
• Custom request body mode with JSON editor and syntax highlighting
• Real-time bidirectional synchronization between chat UI and custom request body
• Persistent message storage that survives page refresh
• Enhanced configuration export/import including message data
• Improved parameter organization with collapsible sections
Technical Changes:
• Add loadMessages/saveMessages functions in configStorage
• Update usePlaygroundState hook to handle message persistence
• Refactor SettingsPanel to remove System Prompt in custom mode
• Add STORAGE_KEYS constants for better storage key management
• Implement debounced auto-save for both config and messages
• Add hash-based change detection to prevent unnecessary updates
UI/UX Improvements:
• Disabled state styling for parameters in custom mode
• Warning banners and visual feedback for mode switching
• Mobile-responsive design for custom request editor
• Consistent styling with existing design system
- Replace gradient background with purple theme matching EditChannel cards
- Add decorative circle elements for visual consistency
- Update all icons and text to white color for better contrast
- Apply inline styles to ensure proper color rendering
- Maintain hover effects with adjusted opacity values
This change creates visual consistency across the application by adopting
the same modern gradient design pattern used in EditChannel header cards.
- Replace pink-purple gradient with indigo-purple gradient to match PersonalSetting.js color scheme
- Update icon container gradient from purple-indigo to indigo-purple for consistency
- Enhance shadow effects from shadow-sm to shadow-lg to align with card design standards
- Improve hover effects with refined opacity and smoother transitions (duration-300)
- Increase content background opacity from 70% to 80% for better readability
- Update scrollbar color to purple theme (rgba(139, 92, 246, 0.3))
- Standardize border radius to rounded-xl for unified styling
- Apply consistent styling to "thinking in progress" state with matching gradient background
This change ensures visual consistency across the application by adopting the same
purple-blue color palette used in PersonalSetting component, creating a more
cohesive user experience.
- Fix thinking content area scroll functionality in MessageContent.js
* Replace max-h-50 with explicit maxHeight style (200px)
* Add thinking-content-scroll CSS class for proper scrollbar styling
* Ensure scrollbars are visible when content exceeds container height
- Add thinking-content-scroll CSS class in index.css
* Define webkit scrollbar styles with proper dimensions (6px)
* Add hover effects and cross-browser compatibility
* Support both webkit and Firefox scrollbar styling
- Remove unused CSS classes to improve code cleanliness
* Remove .hide-on-mobile class (no usage found in codebase)
* Remove .debug-code class (no longer needed)
- Improve user experience for viewing lengthy thinking content
* Users can now properly scroll through AI reasoning content
* Maintains content visibility with appropriate height constraints
Resolves issue where thinking section had max height but no scrolling capability.
- Add intelligent content truncation for payloads over 50K characters
- Implement tiered performance handling based on content size
- Use useMemo and useCallback for memory optimization and caching
- Add progressive loading with async processing for very large content
- Introduce performance warning indicators and user feedback
- Create expand/collapse functionality with smooth animations
- Skip syntax highlighting for extremely large content (>100K)
- Add loading states and debounce handling for better UX
- Display remaining content size indicators (e.g., +15K)
- Implement chunk-based processing to prevent UI blocking
This optimization ensures that even multi-megabyte JSON responses
won't cause page freezing or performance degradation in the debug
panel, while maintaining full functionality for regular-sized content.
- Change response content language from 'javascript' to 'json' for proper highlighting
- Improve automatic JSON detection to handle both objects and arrays
- Add intelligent content type detection based on string patterns
- Include development environment debug logging for troubleshooting
- Ensure all API responses display with correct JSON syntax coloring
This fix resolves the issue where API response data was not properly
syntax highlighted, ensuring consistent JSON formatting across all
debug panel tabs (preview, request, and response).
- Create new CodeViewer component with VS Code dark theme styling
- Implement custom JSON syntax highlighting with proper color coding
- Add improved copy functionality with hover effects and user feedback
- Refactor DebugPanel to use the new CodeViewer component
- Apply dark background (#1e1e1e) with syntax colors matching VS Code
- Enhance UX with floating copy button and responsive design
- Support automatic JSON formatting and parsing
- Maintain compatibility with existing Semi Design components
The debug panel now displays preview requests, actual requests, and
responses in a professional code editor style, improving readability
and developer experience in the playground interface.
- Replace Semi UI's MarkdownRender with react-markdown library for better performance and features
- Add comprehensive markdown rendering support including:
* Math formulas with KaTeX
* Code syntax highlighting with rehype-highlight
* Mermaid diagrams support
* GitHub Flavored Markdown (tables, task lists, etc.)
* HTML preview for code blocks
* Media file support (audio/video)
- Create new MarkdownRenderer component with enhanced features:
* Copy code button with hover effects
* Code folding for long code blocks
* Responsive design for mobile devices
- Add white text styling for user messages to improve readability on blue backgrounds
- Update all components using markdown rendering:
* MessageContent.js - playground chat messages
* About/index.js - about page content
* Home/index.js - home page content
* NoticeModal.js - system notice modal
* OtherSetting.js - settings page
- Install new dependencies: react-markdown, remark-math, remark-breaks, remark-gfm,
rehype-katex, rehype-highlight, katex, mermaid, use-debounce, clsx
- Add comprehensive CSS styles in markdown.css for better theming and user experience
- Remove unused imports and optimize component imports
Breaking changes: None - maintains backward compatibility with existing markdown content
- Extract common `applyAutoCollapseLogic` function for reasoning panel collapse behavior
- Consolidate duplicated auto-collapse logic across multiple functions
- Simplify conditional expressions using logical OR operator
- Replace repetitive property assignments with object spread syntax
- Update dependency arrays to include new shared function
- Ensure consistent behavior across stream/non-stream/error scenarios
This refactoring improves code maintainability by following DRY principles
and centralizing the auto-collapse logic in a single reusable function.
All message handling functions now use consistent logic for determining
when to auto-collapse the reasoning panel.
Benefits:
- Reduced code duplication from ~20 lines to 6 lines per function
- Single source of truth for auto-collapse behavior
- Improved readability and maintainability
- Easier to modify collapse logic in the future
Files changed:
- web/src/hooks/useApiRequest.js: Refactored message handling functions
- Add `hasAutoCollapsed` flag to track auto-collapse state
- Modify reasoning panel to auto-collapse only once after thinking completion
- Allow users to manually toggle reasoning panel after auto-collapse
- Update message creation, streaming updates, and completion handlers
- Ensure consistent behavior across stream/non-stream requests and error cases
Previously, the reasoning/thinking panel would auto-collapse every time
the AI completed its thinking process, preventing users from reopening
it to review the reasoning content. Now it auto-collapses only once
when thinking is complete, then allows full user control.
Files changed:
- web/src/hooks/useApiRequest.js: Updated all message handling functions
- web/src/utils/messageUtils.js: Added hasAutoCollapsed to initial state
Previously, the "thinking" indicator and loading icon would only disappear
after the entire message generation was complete, which created a poor user
experience where users had to wait for the full response to see that the
reasoning phase had finished.
Changes made:
- Add `isThinkingComplete` field to independently track reasoning state
- Update streaming logic to mark thinking complete when content starts flowing
- Detect closed `<think>` tags to mark reasoning completion
- Modify MessageContent component to use independent thinking state
- Update "思考中..." text and loading icon display conditions
- Ensure thinking state is properly set in all completion scenarios
(non-stream, errors, manual stop)
Now the thinking section immediately shows as complete when reasoning ends,
rather than waiting for the entire message to finish, providing much better
real-time feedback to users.
Files modified:
- web/src/hooks/useApiRequest.js
- web/src/components/playground/MessageContent.js
- web/src/utils/messageUtils.js
Update tooltip messages from "正在生成中，请稍候..." to "操作暂时被禁用"
in MessageActions component to better reflect that actions can be disabled
during both message generation and editing states.
Changes:
- Replace specific "generating" message with generic "temporarily disabled" message
- Applies to retry, edit, role toggle, and delete action tooltips
- Provides more accurate user feedback for disabled states
Files modified:
- web/src/components/playground/MessageActions.js
- Cache initial config using useRef to prevent repeated loadConfig() calls
- Fix useEffect dependencies to only trigger on actual config changes
- Modify debouncedSaveConfig dependency from function reference to actual config values
- Update handleConfigReset to use DEFAULT_CONFIG directly instead of reloading
- Prevent excessive console logging during chat interactions and frequent re-renders
This resolves the issue where console was flooded with:
"配置已从本地存储加载" and "配置已保存到本地存储" messages,
especially during active chat sessions where logs appeared every second.
Fixes: Frequent config load/save operations causing performance issues
Completely restructured the Playground component from a 1437-line monolith
into a maintainable, modular architecture with 62.4% code reduction (540 lines).
**Key Improvements:**
- **Modular Architecture**: Extracted business logic into separate utility files
- `utils/constants.js` - Centralized constant management
- `utils/messageUtils.js` - Message processing utilities
- `utils/apiUtils.js` - API-related helper functions
- **Custom Hooks**: Created specialized hooks for better state management
- `usePlaygroundState.js` - Centralized state management
- `useMessageActions.js` - Message operation handlers
- `useApiRequest.js` - API request management
- **Code Quality**: Applied SOLID principles and functional programming patterns
- **Performance**: Optimized re-renders with useCallback and proper dependency arrays
- **Maintainability**: Implemented single responsibility principle and separation of concerns
**Technical Achievements:**
- Eliminated code duplication and redundancy
- Replaced magic strings with typed constants
- Extracted complex inline logic into pure functions
- Improved error handling and API response processing
- Enhanced code readability and testability
**Breaking Changes:** None - All existing functionality preserved
This refactor transforms the codebase into enterprise-grade quality following
React best practices and modern development standards.
- Add role toggle button in MessageActions component for assistant/system messages
- Implement handleRoleToggle function in Playground component to switch between assistant and system roles
- Add visual distinction for system messages with orange badge indicator
- Update roleInfo configuration to use consistent avatars for assistant and system roles
- Add proper tooltip texts and visual feedback for role switching
- Ensure role toggle is disabled during message generation to prevent conflicts
This feature allows users to easily switch message roles between assistant and system,
providing better control over conversation flow and message categorization in the playground interface.
- Add real-time request body preview that updates when parameters change
- Implement pre-constructed payload generation for debugging without sending requests
- Add support for image URLs in preview payload construction
- Upgrade debug panel to card-style tabs with custom arrow navigation
- Add collapsible functionality and dropdown menu for tab selection
- Integrate image-enabled messages with proper multimodal content structure
- Refactor tab state management with internal useState and external sync
- Remove redundant status labels and clean up component structure
- Set preview tab as default active tab for better UX
- Maintain backward compatibility with existing debug functionality
This enhancement significantly improves the debugging experience by allowing
developers to see exactly what request will be sent before actually sending it,
with real-time updates as they adjust parameters, models, or image settings.
Add a toggle switch to enable/disable image uploads in the playground,
with automatic disabling after message sending to prevent accidental
image inclusion in subsequent messages.
Changes:
- Add `imageEnabled` field to default configuration with false as default
- Enhance ImageUrlInput component with enable/disable toggle switch
- Update UI to show disabled state with opacity and color changes
- Modify message sending logic to only include images when enabled
- Implement auto-disable functionality after message is sent
- Update SettingsPanel to pass through new imageEnabled props
- Maintain backward compatibility with existing configurations
User Experience:
- Images are disabled by default for privacy and intentional usage
- Users must explicitly enable image uploads before adding URLs
- After sending a message with images, the feature auto-disables
- Clear visual feedback shows current enabled/disabled state
- Manual control allows users to re-enable when needed
This improves user control over multimodal conversations and prevents
unintentional image sharing in follow-up messages.
Fix TypeError when processing multimodal messages containing both text and images.
The error "textContent.text.trim is not a function" occurred when textContent
was null or textContent.text was not a string type.
Changes:
- Add comprehensive type checking for textContent.text access
- Implement getTextContent() utility function for unified content extraction
- Enhance error handling to support multimodal content display
- Fix message copy functionality to handle array-format content
- Improve message reset functionality to extract text content for retry
- Add user-friendly warnings when copying messages without text content
Technical improvements:
- Validate textContent existence and text property type before calling trim()
- Extract text content from multimodal messages for operations like copy/retry
- Maintain backward compatibility with string-format content
- Preserve all existing functionality while adding robust error handling
Fixes issues with:
- Image + text message processing
- Message copying from multimodal content
- Message retry with image attachments
- Error display for complex message formats
This ensures the playground component handles multimodal content gracefully
without breaking existing text-only message functionality.
