feat(schedule): group list view by festival day with sticky header

[chiptus]

Groups the List view's sets into per-day sections (day boundary computed in the festival timezone) so the day header sticks for the whole day instead of unsticking after one screen; the standalone filters row is removed and the Filters trigger now lives in the sticky day header.

Closes #235

Verification

• Open the List view for an edition spanning multiple festival days; scroll through a full day and confirm the day header stays docked below the top bar the whole time, handing over to the next day's header at the boundary.
• Confirm the standalone "Filters" row is gone and the Filters trigger (with badge/count) opens the same filter sheet from the sticky day header.
• Apply/clear day, time, stage, and vote filters from the sheet and confirm behavior is unchanged from before.
• pnpm run typecheck, pnpm run lint, and pnpm test all pass.

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Project	Deployment	Actions	Updated (UTC)
upline	Ready	Preview, Comment	Jul 27, 2026 12:08pm

[Copilot]

Pull request overview

Updates the Schedule “List” tab to render sets grouped by festival day (using the festival timezone) so each day is a continuous section with a sticky day header that also hosts the Filters trigger.

Changes:

• Group list schedule rendering into per-day sections and introduce a dedicated sticky day header component per festival day.
• Move the Filters trigger into the sticky day header (removing the standalone List-view filters row) and improve the trigger’s accessible label.
• Add/adjust Playwright e2e coverage for sticky day header behavior and opening the filter sheet from the day header.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/e2e/schedule-list-day-header.spec.ts	Adds new e2e coverage for sticky day header behavior and opening filters from the header.
tests/e2e/schedule-filter-sheet.spec.ts	Updates filter-sheet e2e to use the first matching trigger and reflects the new List header location.
src/pages/EditionView/tabs/ScheduleTab/ScheduleFilterSheet.tsx	Adds an aria-label to the filter trigger so it has an accessible name (including active count).
src/pages/EditionView/tabs/ScheduleTab/list/TimeSlotGroup.tsx	Removes the per-slot sticky date header so slots can live under a single per-day sticky header.
src/pages/EditionView/tabs/ScheduleTab/list/ListTab.tsx	Removes the standalone List filters row and renders only the List schedule content.
src/pages/EditionView/tabs/ScheduleTab/list/ListSchedule.tsx	Computes day-grouped time slots (by festival day key) and renders per-day groups.
src/pages/EditionView/tabs/ScheduleTab/list/ListDayGroup.tsx	New component: renders a per-day sticky header (with Filters trigger) and that day’s time slots.

Comments suppressed due to low confidence (1)

tests/e2e/schedule-list-day-header.spec.ts:56

• Same potential flake here: strict equality on getBoundingClientRect().top can fail due to subpixel rounding differences between elements/scroll positions.

    const topAfter = await secondHeader.evaluate(
      (el) => el.getBoundingClientRect().top,
    );
    expect(topAfter).toBe(topBefore);
  });