feat: Improved IPC image handling and added vision model support.

- Improved IPC image handling to return mime type and base64 encoded data alongside the image data.
- Updated type definition for `base64` method in image object to return an object with mime, base64, and data properties.
- Added support for vision models using new function and regex.
- Table cell size has been reduced on the FilesPage component.
- Added support for vision model attachments.
- Added model dependency to AttachmentButton component.
- Implemented new functionality to handle image messages in the GeminiProvider class.
- Update image base64 encoding to directly use API response data.

src/preload/index.d.ts

@@ -31,7 +31,7 @@ declare global {
         all: () => Promise<FileMetadata[]>
       }
       image: {
-        base64: (filePath: string) => Promise<string>
+        base64: (filePath: string) => Promise<{ mime: string; base64: string; data: string }>
       }
     }
   }