Summary

This PR delivers a full vectorscope upgrade across core, presenter/view types, and GUI, and fixes the final integration issue in the branch.

Main changes included in this branch:

• Resolved issue [Feature] Don't present a blank workspace when orc-gui is opened - guide the user instead #160 and issue [Feature] Tape input tbc support #167 fixes that unblock/clean up preview behavior.
• Reworked vectorscope analysis to use a unified plotting/graticule math path, reducing divergence between render paths.
• Added and completed NTSC component vectorscope work (issue Vectorscope doesn't look correct for NTSC #81), including:
  • rename/terminology cleanup to component vectorscope
  • active-area-only toggle support
  • geometry handling updates for consistent plotting bounds
• Expanded VFR-based preview visualizations so they are available from all relevant stages, including chroma decoders.
• Completed vectorscope naming cleanup and consistency updates across GUI/core/view types.
• Fixed issue Vectorscope graticule improvements #82 integration behavior on top of the above work.

Coverage and regression protection added in this branch:

• New core vectorscope analysis tests.
• Expanded preview type and preview view registry tests.
• New GUI vectorscope geometry unit tests.
• Build/test wiring updates so new test targets are included.

Type of change

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

Validation

Executed locally on this branch:

• cmake --build build -j
• ctest --test-dir build --output-on-failure

Result:

• 653/653 tests passed
• 0 failed
• Total test time: 15.28s

Checklist

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

Related issue

Closes #81, #82, #160 and #167