Improve direct camera capture for image upload on Android

[AnthonyRonning]

Summary

A user asked for image capture and upload directly from the app. On iOS, the native file picker appears to handle this by offering camera capture for image inputs. On Android, the current Maple implementation may not reliably offer direct camera capture because image upload uses a standard hidden HTML file input and does not explicitly wire Android camera capture.

Current implementation

Image upload is implemented in frontend/src/components/UnifiedChat.tsx with a hidden file input:

<input
  type="file"
  ref={fileInputRef}
  accept="image/jpeg,image/jpg,image/png,image/webp"
  multiple
  onChange={handleAddImages}
  className="hidden"
/>

The upload action calls fileInputRef.current?.click() from the Add Images menu item.

Findings

• iOS has NSCameraUsageDescription and WKWebView/native controls likely offer Take Photo automatically for image file inputs.
• Android has android.permission.CAMERA in the manifest, but there is no explicit Android camera integration.
• No capture attribute is set on the file input.
• No Android ACTION_IMAGE_CAPTURE, custom onShowFileChooser, or native image picker integration was found.
• Current Android behavior likely depends on Android WebView/Tauri default file chooser behavior, which may vary by device.

Desired behavior

On Android, tapping Add Images should reliably offer a direct way to take a new photo and attach it, not only choose an existing image from files/photos.

Potential approaches

• Test current behavior on Android devices and document what the picker offers.
• Consider adding a dedicated Take Photo path for mobile Android.
• Consider whether adding capture is appropriate, or whether a native camera/image picker integration gives a better UX while preserving the existing gallery/file upload flow.