Add "Take a photo" option to the "+" FAB menu

[Lightz2002]

Adds a dedicated "Take a photo" mini FAB to the "+" button menu, so users can
launch the camera and upload the capture directly — without going through
Upload → Picture from camera.

The existing camera option in the Upload bottom sheet remains unchanged.

Changes

• main_file_list_fragment.xml: new fab_take_photo mini FAB with label,
  content description, and a new camera icon (ic_action_take_photo)
• MainFileListFragment.kt:
  • registerFabTakePhotoListener() reuses the existing
    uploadActions?.uploadFromCamera() flow (FilesUploadHelper)
  • Wired into FAB expand/collapse focus handling and collapseFab()
  • Hidden together with Upload/New document when the current folder has no
    add-file permission; shown/hidden with the rest of the FAB group

Behavior

• Tap "+" → "Take a photo" → system camera opens → captured photo is uploaded
  to the current folder (same path as Upload → Picture from camera)
• No new permissions; still delegates to the system camera app via
  ACTION_IMAGE_CAPTURE