feat: interactive full-screen view mode with copy toast (1.3.0)

[Zhen-Bo]

Summary

Adds an interactive full-screen view mode to the queue sidebar gallery,
decouples queue refresh from ComfyUI internals, and fixes stale locale
serving. Ships as 1.3.0.

New feature

• Full-screen view mode for gallery images: wheel-zoom, drag-pan
  (grab/grabbing cursor), and a top-left help hint bar.
• Copy original image to clipboard via Ctrl+C, with a toast confirmation
  on success and an error toast on failure. A stale (slow) copy result can
  no longer overwrite a newer toast.
• Load-workflow button to restore an image's workflow from view mode.
• Toast styling: opaque dark surface, coloured text/border, slide-up
  entrance + fade, shown one at a time and raised above the gallery counter.

Refactor

• Refresh the queue from ComfyUI status events instead of patching
  ComfyUI internals, removing fragile monkey-patching of queuePrompt.

Bug fix

• Revalidate locale JSON on load so translation edits are not served stale.

Docs

• Add project SPEC and ARCHITECTURE (English + Traditional Chinese),
  with the architecture diagram updated to drop the removed hook.

Testing

• Local npm test passed: 7 test files, 140 tests.