* fix: restore T2I text template rendering
- keep using {{ text | safe }} instead of text_base64
- inject Shiki runtime by default for T2I templates
- update built-in templates to read markdown from a hidden textarea
- improve WebUI preview sample text and Shiki runtime serving
- add regression tests for template rendering and runtime injection
* fix: prevent injected Shiki runtime from breaking T2I templates
* fix(t2i): restore raw text template rendering
* test(t2i): remove test
* fix(t2i): restore previewText
* perf(dashboard): subset MDI icon font and self-host Google Fonts
* perf(dashboard): subset MDI icon font and self-host Google Fonts
* perf(dashboard): subset MDI icon font and self-host Google Fonts
* perf(dashboard): subset MDI icon font cr fix
* chore: update lockfile
* feat: implement websockets transport mode selection for chat
- Added transport mode selection (SSE/WebSocket) in the chat component.
- Updated conversation sidebar to include transport mode options.
- Integrated transport mode handling in message sending logic.
- Refactored message sending functions to support both SSE and WebSocket.
- Enhanced WebSocket connection management and message handling.
- Updated localization files for transport mode labels.
- Configured Vite to support WebSocket proxying.
* feat(webchat): refactor message parsing logic and integrate new parsing function
* feat(chat): add websocket API key extraction and scope validation
* feat: 添加并优化服务提供商独立测试功能
* feat: add small size to action buttons in ItemCard and ProviderPage for better UI consistency
---------
Co-authored-by: Soulter <905617992@qq.com>
