Add zoom and pan to previews, full-size RAW previews, neighbor prefetch

- Lightbox now supports wheel zoom around the cursor, drag panning, and
  double-click toggle between fit and 1:1 pixel view, in both transfer
  and library modes
- TIFF-based RAW (CR2, NEF, ARW, DNG) and CR3 previews now use the
  full-resolution JPEG embedded by the camera instead of the small EXIF
  thumbnail, extracted by walking the TIFF IFDs / ISO-BMFF boxes
- Adjacent photos are prefetched while previewing so arrow-key
  navigation does not wait on SD card reads

Keep rejects in _Rejects folder instead of erasing them

Deleting from the card previously left rejects with zero copies anywhere.
Now they are moved (with the same copy verification as transfers) into
Destination/_Rejects by default; permanent deletion is an opt-in toggle.
Library-mode deletes go to the OS trash with a hard-delete fallback.

Attach all platform binaries via single release job, bump to 1.0.4

Publish releases directly instead of drafts, bump to 1.0.3

Regenerate lockfile with npm 10 for CI compatibility, bump to 1.0.2

Sync package-lock with renamed package, bump to 1.0.1

Add MIT license, cross-platform support, and release builds

- LICENSE file and license/author/repository metadata in package.json
- SD card detection on macOS (/Volumes) and Linux (/media, /run/media),
  with DCIM-based camera card detection on all platforms
- Native window frame on Linux (overlay title bar is Windows/macOS only)
- electron-builder targets: nsis (Windows), dmg/zip (macOS),
  AppImage/deb (Linux) with per-platform package scripts
- GitHub Actions workflow builds all three platforms and attaches
  binaries to the release on v* tags
- README: download section, per-platform build instructions, normal dashes