refactor: share anonymous write-count helpers and drop prompt scaffolding

[cursor]

What and why

Nightly cleanup of merges after #4490, focused on #4501 (local-mode connect prompt), #4504 (timed start-date tab skip), #4495 (macOS description lists), and #4492 (event form scroll ids).

The save toast and connect prompt now share one write-count reader, incrementer, and nudge threshold instead of a mutation-runtime alias plus a one-caller storage file. Eligibility no longer takes a threshold parameter. The prompt reuses PH_NO_RAGECLICK_CLASS and reads write count from the eligibility hook. Timed start-date tab skip is a tabIndex prop. macOS description ordered/unordered lists share one renderer, and the schedule section keeps a single scroll id (end maps to start).

Left alone: AuthStore success paths (trial vs reset-token stay distinct), Welcome Enter vs connect-prompt Enter (different delegation rules), first-event celebration, TimePicker commit-draft event, calendar notice stack (still two views), TimeGrid hit-test passes, ContactsAPI, ShiftHintOverlay.

Verify

VERDICT: PASS

Checks run: test:web, type-check, lint, knip, test:a11y 65/65, test:e2e 248/248.

CI-only: test:macos / test:macos:packages (no Xcode on this machine).

  

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Note

Low Risk
Refactor and UI polish only—shared constants and storage consolidation with no auth or write-path behavior changes beyond existing nudge thresholds.

Overview
Anonymous calendar nudges now share one module: ANONYMOUS_CALENDAR_WRITE_NUDGE_COUNT (3), readAnonymousCalendarWriteCount, and incrementAnonymousCalendarWriteCount live in anon-calendar-write-count.util.ts. The save toast and local-mode connect prompt both use that threshold; mutation-runtime aliases and local-mode-connect.storage.ts are removed, with dismiss state read/written inline in the connect-prompt store. Eligibility no longer takes a configurable threshold, and useLocalModeConnectPromptEligible returns { isLive, writeCount } for the banner.

PostHog renames the shared rage-click opt-out class to PH_NO_RAGECLICK_CLASS (grid components and the connect prompt).

Web event form passes tabIndex={excludeFromTabOrder ? -1 : undefined} on the date DatePicker so timed start dates can be skipped in tab order without forcing tabIndex: -1 when they should stay focusable.

macOS collapses schedule scroll targets to a single .id(EventFormField.start) and scrolls to that section when focus is .end. Description HTML list blocks share a private appendList helper for ordered and unordered rendering.

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[github-actions]

Boot bundle: 509.6 KB gzip (+0.0 KB vs main)