Summary

This PR bundles the fixes from issues #142, #147, #148, #149, #150, and #151.

• Fixes the Mask Line stage cache-bounds issue and adds regression coverage for the affected behavior.
• Fixes the broken README link.
• Normalizes several GUI shortcuts to avoid OS-level conflicts and improves graph-view deletion behavior by supporting Backspace alongside Delete.
• Refactors the Field Timing dialog for better responsiveness and usability, including draft rendering during interactive zoom, improved zoom mapping, preserved visible-line state, and cleaner navigation controls.
• Hardens video-parameter handling across chroma decoding and the video-params stage by introducing shared safety/sanitization logic for unsafe or incomplete metadata, then adds regression tests across the affected decoders and stage paths.
• Improves the stage-parameter editing flow so video-params can be prefilled and reset from upstream metadata, with stronger cross-field validation and clearer metadata-file warnings in the dialog.

Type of change

• Bug fix
• New feature
• Refactor
• Documentation
• Other

Validation

• Reviewed the full branch diff against origin/main.
• Confirmed new/updated unit coverage was added for Mask Line, video_params, and chroma_sink decoder/stage safety paths.
• Checked the latest recorded local CTest artifacts. The most recent recorded full test run is not clean and still lists 1 failing test:
  • PalColourTest.decodeFrames_compositePath_matchesGoldenVector
• No fresh build or test run was started as part of preparing this PR summary.

Checklist

• Scope is focused and minimal
• Build passes locally
• Related docs were updated if needed
• Linked issue (if applicable)

Related issue

Closes #142, #147, #148, #149, #150, #151