[WRONG BRANCH] fix(gui): protect parked prompt-layer drafts

[luvs01]

Motivation

• The in-dialog navigation activated parked drafts in memory but the close/save guard only considered the currently visible layer, which could silently discard edits parked on other layers.
• The change prevents data loss for unsaved custom prompt-layer text when switching targets inside the same dialog.

Description

• Track parked drafts and whether any parked draft differs from its persisted sibling by keeping per-layer drafts in draftsRef and a parkedDirty flag; added othersRef to safely compare against the saved layers without widening effect deps.
• Require explicit confirmation before closing or saving if any parked draft is dirty by introducing discardAction and routing close/save through requestClose / requestSave which show the existing discard UI when needed.
• Wire the Save button to requestSave so a Save from another layer defers until the user confirms discard/save of parked drafts.
• Added a regression test (8b. closing or saving another layer warns about a parked edit) in gui/tests/codex-set-stack.test.tsx that exercises both the close and save paths and verifies the server PUT behavior.

Testing

• Ran the focused GUI test file with cd gui && bun test tests/codex-set-stack.test.tsx, and all tests in that file passed (including the new regression).
• Ran cd gui && bun run lint and cd gui && bun run build and both completed successfully (lint produced only a benign hook warning earlier that was addressed).
• Attempting the full cd gui && bun test tests run exercised the wider suite; the focused changes are green but the full suite encountered unrelated environment-specific failures (missing Jest timer helpers and a node:zlib symbol) that are not caused by this change.

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⏳ DRAFT

• wrong target branch (main); retarget to dev. UI screenshot required.

What to do

• Retarget this PR to dev — all contributions go to dev.
• Add a screenshot of the UI change to the PR description.

Its title has been prefixed with [WRONG BRANCH].
This pull request was already a draft. Its draft status will be preserved after every issue above is resolved.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve the layer selected when Save was requested

When a parked draft triggers the Save confirmation, discardAction records only "save" while draft continues to follow the displayed layer. The header navigation remains enabled, so moving to another layer before clicking Discard makes this callback save that newly displayed layer instead of the layer for which Save was requested; pressing Escape similarly routes through requestClose and changes the pending action to "close". Capture the pending normalized draft when opening the confirmation, or lock navigation and treat Escape as cancellation while it is active.

AGENTS.md reference: gui/AGENTS.md:L31-L34

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