Improve turn start feedback

[gbarros-dev]

Summary

• keep the turn-start status visible from send click through draft promotion and provider start
• move transient local dispatch state into a non-persisted per-thread store so route/component remounts do not hide the loading row
• keep the elapsed timer continuous when the label changes from Starting request to Working
• add unit and browser coverage for dispatch-state persistence, acknowledgement, and the draft first-send transition

Verification

• vp test apps/web/src/session-logic.test.ts apps/web/src/localDispatchStore.test.ts apps/web/src/components/ChatView.logic.test.ts apps/web/src/components/chat/MessagesTimeline.logic.test.ts
• cd apps/web && vp test run src/components/ChatView.browser.tsx --project browser -t "sends bootstrap turn-starts"
• vp check
• vp run typecheck

Note: vp check exits successfully and still reports existing react(no-unstable-nested-components) warnings outside this change.

Note

Show 'Starting request' label before the AI turn begins in the chat timeline

• Adds a phase field ('starting' | 'running') to the working timeline row in MessagesTimeline.logic.ts, driving distinct UI labels: "Starting request for..." before the turn begins and "Working for..." once it is running.
• Moves local dispatch state from React component state into a per-thread Zustand store (localDispatchStore.ts), preserving the original start timestamp across re-renders and preventing navigation between threads from clearing in-flight dispatch state.
• Updates hasServerAcknowledgedLocalDispatch in ChatView.logic.ts so acknowledgement requires a new turn with a non-null startedAt, not just a session metadata change.
• Reorders deriveActiveWorkStartedAt in session-logic.ts to prefer the local send timestamp when available, falling back to the running turn's startedAt for recovered sessions.

^{Macroscope summarized 74d6dc1.}

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Note

Medium Risk
Touches send/busy state, draft promotion, and when local vs server work is shown—user-visible timing bugs are possible but changes are well covered by unit and browser tests.

Overview
Improves chat feedback from send through provider turn start by keeping a per-thread local dispatch in a new Zustand localDispatchStore (keyed by scoped thread ref) instead of ChatView component state, so draft promotion and remounts no longer drop the loading row.

Acknowledgement logic in hasServerAcknowledgedLocalDispatch now clears local dispatch only when the latest turn actually changes and has a startedAt, not on incidental session metadata updates—matching the new “starting” window.

The timeline working indicator gains a phase (starting | running): copy shows “Starting request” until latestTurn is running with a start time, then “Working”. deriveActiveWorkStartedAt prefers the local send timestamp when present so the elapsed timer stays continuous across the label change.

ChatView stops resetting local dispatch on draftId/threadId changes; optimistic message cleanup still runs on thread id change. Tests cover store behavior, acknowledgement, timeline phases, draft first-send browser flow, and session timing.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces new state management infrastructure and changes runtime behavior for turn feedback timing. An unresolved review comment identifies a potential bug where the working timer may reset during phase transitions, which warrants human review.

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