refactor(web): drop draft context setters for setLocalDraft

[tyler-dane]

Summary

• Week draft actions now expose setLocalDraft (the local portal draft setter).
• DraftContext no longer publishes the internal setters bag; DraftProvider keeps setters private to actions/effects.
• Draft.tsx and WeekInteractionCoordinator call actions.setLocalDraft instead of setters.setDraft.

Simplicity

Net reduction: context value dropped an entire setters surface; tests stopped stubbing empty setters. Hook complexity stayed flat — no new useEffect/useRef/useState. setLocalDraft is a named alias of the existing setDraft dispatch so the public action matches intent without wrapping behavior.

Manual Testing Steps

• In Week view, click an event to open the form → draft overlay and sidebar stay in sync while editing the title.
• Right-click → Edit → form and draft overlay show that event.
• Drag a saved event while its form was open, then release with a move → form reopens on the updated times (local + store draft restored).
• Arrow-nudge a create draft while the form is open → times stay moved.

Test plan

• bun test:web focused Draft/MainGrid/shortcuts suites (53 pass)
• bun run type-check:web-tests + web app tsc --noEmit
• bun lint

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