refactor(timeline): centralize time-pixel scale

[chiptus]

Extracts timeToOffset/offsetToTime in timelineCalculator.ts as the single place the timeline's 2px/minute scale lives, so TimeScale and set-block positioning consume the mapping instead of re-deriving the 2/120 pixel constants.
Rendering is unchanged — blocks and axis marks land at identical pixel positions before and after.

Closes #191

Verification

• pnpm run lint, pnpm run typecheck, and pnpm vitest run all pass (367 tests, including new src/lib/timelineCalculator.test.ts).
• Open the horizontal Schedule timeline tab; hour markers, day-boundary labels, and set blocks render at the same positions as before this change.
• Confirm no other file under src/pages/EditionView/tabs/ScheduleTab/horizontal/ still hardcodes the 2/120 pixel-per-minute/hour scale (grep -rn "\* 2\b\|\* 120\b" src/pages/EditionView/tabs/ScheduleTab).

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Generated by Claude Code

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Project	Deployment	Actions	Updated (UTC)
upline	Ready	Preview, Comment	Jul 14, 2026 6:26pm

[Copilot]

Pull request overview

This PR centralizes the schedule timeline’s time↔pixel scale in src/lib/timelineCalculator.ts by introducing shared conversion helpers, then updates the horizontal timeline UI and layout calculations to consume those helpers instead of re-deriving 2px/min / 120px/hr constants.

Changes:

• Added timeToOffset / offsetToTime helpers (and a single PX_PER_MINUTE constant) to the timeline geometry module.
• Updated TimeScale hour-marker and day-boundary positioning to use timeToOffset.
• Refactored set positioning and totalWidth computation in calculateTimelineData to use the new mapping, and added unit tests for the mapping and boundary behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/pages/EditionView/tabs/ScheduleTab/horizontal/TimeScale.tsx	Replaces hardcoded pixel math with timeToOffset for axis/day-boundary positioning.
src/lib/timelineCalculator.ts	Introduces centralized time↔pixel conversion helpers and refactors layout math to use them.
src/lib/timelineCalculator.test.ts	Adds unit coverage for the new mapping helpers and timeline boundary calculations.