Persist pending plan-mode answers across thread re-entry

[Jmqcooper1]

Summary

• persist in-progress plan-mode user-input answers and question index in the web composer draft store
• restore pending plan-mode question progress when re-entering a thread and prune stale request drafts when the request is resolved
• add unit coverage for pending user-input draft state and a browser regression for leaving and re-entering the thread mid-questionnaire

Testing

• bun run test -- src/composerDraftStore.test.ts src/pendingUserInput.test.ts
• bun run test:browser -- src/components/ChatView.browser.tsx
• bun fmt
• bun lint
• bun typecheck

Fixes #918

Note

Persist pending plan-mode answers across thread re-entry in composer draft store

• Replaces local React state for pending user-input answers and question indices in ChatView with per-thread state backed by composerDraftStore, so answers survive component unmounts and thread navigation.
• Adds setPendingUserInputAnswer, setPendingUserInputQuestionIndex, syncPendingUserInputRequests, and clearPendingUserInputRequest actions to the store, with persistence and hydration support.
• An effect in ChatView syncs open request IDs from thread activities into the store when the active thread changes, pruning stale entries.
• Thread drafts containing only pending user-input data are now retained rather than pruned by shouldRemoveDraft.
• Behavioral Change: pending user-input answers are now serialized to the persisted draft store and reloaded on hydration.

^{Macroscope summarized 7dbbd9f.}

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