fix: UI polish and provider fixes

- Add animate-pulse CSS animation for loading states
- Add Ctrl+I/Ctrl+B markdown shortcuts in chat input
- Improve chat input resize with mirror element
- Add reasoning duration display and shimmer effect
- Add confirmation dialog for deleting all models
- Simplify RowVirtualizerDynamic resize handling
- Fix DialogType imports (type -> value)
- Fix ollama cloud model name resolution
- Make vllm auth header optional
- Various icon and styling fixes

server/utils/providers/vllm.ts

@@ -22,7 +22,7 @@ export default {
     async fetchModels({ baseURL, apiKey }) {
         const res = await fetch(`${baseURL}/models`, {
             method: 'GET',
-            headers: { Authorization: `Bearer ${apiKey}` },
+            headers: apiKey ? { Authorization: `Bearer ${apiKey}` } : {},
         });
         const data = await res.json();