chore(deps): bump react-day-picker 9.14 → 10.0.1 (PR #546)

[jmynes]

Summary

Bumps `react-day-picker` from 9.14.0 to 10.0.1.

v10 removes APIs that were deprecated in v9 and renames one classname slot. Migrated all three usages in the codebase.

Prop renames (all required since the v9 names are deleted in v10)

• `initialFocus` → `autoFocus`
• `fromYear={Y}` → `startMonth={new Date(Y, 0)}`
• `toYear={Y}` → `endMonth={new Date(Y, 11)}`

Classname slot rename

• `table` → `month_grid` in the calendar's `classNames` map

Files touched

• `src/components/ui/calendar.tsx` (slot rename)
• `src/components/tickets/date-picker.tsx` (date picker popover used in ticket forms)
• `src/components/backlog/backlog-filters.tsx` (range picker for due-date filter)

Test plan

• `pnpm install` succeeds
• `pnpm lint` clean (no new errors)
• `pnpm test` — 1527 / 1527 pass
• `tsc --noEmit` reports no day-picker-related errors
• CI passes
• Manual UI smoke (recommended post-merge):
  • Open a ticket, change the due date — single-date picker works, keyboard focus lands on the popover
  • Open backlog due-date filter — range picker shows two months, autofocuses, dropdown navigation still respects start/end bounds

Closes #546

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