feat(ui): add ToolRenderer system for Omega chat

Add abstract tool rendering infrastructure to @tpmjs/ui:
- ToolRenderer component with registry-based renderer lookup
- DefaultJsonRenderer as fallback with collapsible JSON display
- RegistrySearchRenderer for registrySearchTool results
- RegistryExecuteRenderer for registryExecuteTool results
- registerBuiltInRenderers() for idempotent initialization

Update Omega chat page to use new ToolRenderer:
- Replace inline ToolCallCard with ToolRenderer component
- Add helper functions to convert between ToolCall and ToolPart
- Remove unused expandedToolCalls state (managed internally)

Also add video file extensions to .gitignore

.gitignore

@@ -16,6 +16,12 @@ dist
 # misc
 .DS_Store
 
+# video files
+*.mp4
+*.webm
+*.mov
+*.avi
+
 # debug
 npm-debug.log*
 yarn-debug.log*