feat(vision): add vision chat mode

- Add new "vision" chat mode to the application
- Implement the `visionChatMode` function to handle vision-based chat interactions
- Update the UI to include a new button to toggle the vision chat mode
- Add new translations for the "vision" chat mode tooltip
- Disable certain UI elements when the vision chat mode is active

src/store/index.tsx

@@ -32,8 +32,8 @@ type State = {
   setIsProcessing: (isProcessing: boolean) => void
   selectedModel: string | null
   setSelectedModel: (selectedModel: string) => void
-  chatMode: "normal" | "rag"
-  setChatMode: (chatMode: "normal" | "rag") => void
+  chatMode: "normal" | "rag" | "vision"
+  setChatMode: (chatMode: "normal" | "rag" | "vision") => void
   isEmbedding: boolean
   setIsEmbedding: (isEmbedding: boolean) => void
   speechToTextLanguage: string