feat: lead-in margin, 0-indexed bars, fix bar number clipping

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- Add 1-bar lead-in margin at timeline start (bar 0, time 0s at margin edge)
- Playhead position includes lead-in offset
- Bar numbers now 0-indexed (0, 1, 2...) in ruler and track grid
- Fix bar number clipping: CLIP_BUFFER increased from 200px to
  max(400px, barWidth+200px) so bars past viewport edge render
- All mouse/time handlers account for lead-in margin (ruler, clip
  drag, section drag/resize, context menu, double-click)
- formatBeat returns 0-indexed bar
- Sub-tab ruler has leadInMargin=0 (no lead-in in clip editor)

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This commit is contained in:

3dtours

2026-07-25 10:25:30 +07:00

parent ff44fd4b8d

commit 8372ee1b98

3 changed files with 87 additions and 64 deletions

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app/static/js/app.precompiled.js

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