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Emi Griffith d38bf0192c Add a season/month time filter + mobile filter sheet (compare & calendar) (#79)
Compare gains a time-of-year filter it never had; the calendar's flat 4-season
filter is upgraded to the same model so both pages filter time identically.

- Shared season/month model in shared.js: seasons are the primary, color-coded
  selector, the 12 months a nested suboption, backed by one Set of month indices.
  seasonFilterDropdown/syncSeasonChecks/applySeasonMonthChange/seasonSummaryText
  plus month<->bitmask helpers, reused by both pages.
- Compare: filter gates r.date's month into computeStats and the distribution;
  instant re-rank, no refetch. Persisted (cmpMonths bitmask) and carried in the
  URL hash (m=, omitted when all 12). Empty-selection hint when a filter excludes
  every day.
- Calendar: checkedSeasons -> checkedMonths, applied in the render loop; persisted
  as calMonths. Season checkbox is checked/indeterminate by how many of its months
  are on.
- Mobile filter sheet (filtersheet.js): a subtle floating pill slides the page's
  filter panel up as a bottom sheet, reachable from anywhere on the page, on both
  compare and calendar. Desktop keeps the inline panel unchanged. Respects
  reduced-motion and the home-indicator inset.

Frontend-only; no backend or payload change.
2026-07-12 05:33:09 +00:00
static Add a season/month time filter + mobile filter sheet (compare & calendar) (#79) 2026-07-12 05:33:09 +00:00