fix(web): keep the typed prompt when a draft changes repo

[t3dotgg]

Reported by dominicroy0: start writing a prompt, notice you are in the wrong repo, switch repos in the draft hero — and your text is gone. The switch minted a fresh empty draft and the typed prompt stayed behind on the old project.

Now the prompt and image attachments move with you to the new project's draft. Session-bound extras (terminal/element contexts, preview annotations, review comments) stay on the source draft because they reference the old thread's sessions; if nothing else remains there, the old draft empties out and drops its sidebar row.

Only the draft repo picker opts into the carry (carryComposerContent). Explicit new-thread surfaces (button, hotkeys, palette, sidebar) keep their mint-fresh behavior.

Store tests cover the move, placeholder stripping, and that blob preview URLs are not revoked.

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Written by Claude Fable 5 via Claude Code.

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Note

Low Risk
Localized draft/composer state changes with guards against clobbering invested destination drafts; no auth, API, or persistence schema changes.

Overview
Fixes losing composer text when switching projects from the draft hero: prompt and image attachments now move to the new project's draft instead of staying on the old one.

Adds moveComposerPromptAndImages on the composer draft store to transfer prompt + images between draft targets without revoking blob preview URLs. Session-bound extras (terminal/element contexts, preview annotations, review comments) stay on the source; inline terminal placeholders are stripped from the moved text and re-applied for the destination's contexts.

useHandleNewThread gains optional carryComposerContent: when set and the user is on a draft route, it moves content after the destination draft is resolved (including async paths), and skips the move if the destination already has user content. Only DraftHeroHeadline's project picker passes this flag; other new-thread entry points stay mint-fresh.

Store tests cover the move, placeholder handling, same-target no-op, and non-revocation of preview URLs.

^{Reviewed by Cursor Bugbot for commit 41e3f33. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Keep typed prompt and images when changing a draft's repo in the chat composer

• When a user changes the selected project on a draft via the project picker, the current prompt text and image attachments are moved to the new draft instead of being discarded.
• Adds moveComposerPromptAndImages to composerDraftStore, which re-anchors inline terminal context placeholders for the destination and clears the source without revoking image preview URLs.
• Extends useHandleNewThread in useHandleNewThread.ts with a carryComposerContent option that triggers the move after the destination draft is resolved, skipping it if the destination already has user content.

^{Macroscope summarized 41e3f33.}

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	11.3 KiB	11.3 KiB	−2 B (−0.0%)	15.1 KiB	✅
Codex	Thread snapshot wire	5.5 KiB	5.5 KiB	0 B (0.0%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	5.9 KiB	5.9 KiB	−2 B (−0.0%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	49.7 KiB	49.7 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	11.4 KiB	11.3 KiB	−36 B (−0.3%)	15.1 KiB	✅
Claude	Thread snapshot wire	5.5 KiB	5.5 KiB	+6 B (+0.1%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	5.9 KiB	5.8 KiB	−42 B (−0.7%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	50.6 KiB	50.6 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: ac1264e · PR result: 41e3f33 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 94.6 KiB
• Claude decoded thread snapshot: 95.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[macroscopeapp]

Approvability

Verdict: Approved 41e3f33

Self-contained UX fix that keeps typed prompt content when a draft changes repo. Well-tested with appropriate guards against edge cases, and limited in scope to draft-to-draft content movement.

^{You can customize Macroscope's approvability policy. Learn more.}