User-defined segment boundaries

[alex-rawlings-yyc]

This change is 

Summary by CodeRabbit

• New Features

  • Added a boundary-editing mode for interlinear text, letting you merge or split segment boundaries directly in the editor.
  • Improved linking between adjacent text boundaries to support cross-segment editing where appropriate.
  • Added clearer on-screen labels and controls for boundary editing.

• Bug Fixes

  • Prevented boundary-editing actions at protected verse-0/superscription boundaries.
  • Kept custom segment boundaries in sync when saving, loading, and resetting drafts.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch segment-boundaries

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