Premium workspace redesign
- Reframed the desktop workflow as Source → Output recipe → Batch summary with responsive wide and compact layouts.
- Added a unified line-icon system, new ImgConverter app icon, clearer hierarchy, progressive disclosure, and polished empty/busy/success/error states.
- Reworked History, Watch, Plugins, Duplicate Finder, Command Preview, and File Manager dialogs into the same visual system.
- Hardened scan/conversion state restoration, stale-result invalidation, cancellation/partial-failure reporting, and completed-output actions.
- Added GUI and packaging regressions, including responsive behavior, semantic state, checkbox rendering, shortcut absence, and frozen multiprocessing startup.
Verification
- 192 tests passed; 3 optional-dependency tests skipped.
- Clean isolated PyInstaller 6.21.0 build on Python 3.12.10.
- Packaged executable converted a PNG fixture to WebP successfully.
- SHA-256 checksum, dependency inventory, SBOM, and provenance are attached.
The Windows executable is unsigned because no trusted code-signing certificate is available on the build host.