fix(codex): preview generated images from saved paths

[auditt98]

Codex imageGeneration completes with a saved PNG, but T3 shows an inert “Image view” row because activity projection drops data.item.savedPath. Markdown image rendering does not cover this path (related: #6441, #6558).

Preserve the saved path as existing data.imagePath metadata and label new generation events “Generated image”. Web, desktop, and mobile reuse their existing signed media-file previews. Base64 image results remain excluded from client activity payloads; no new asset permissions or wire types are introduced.

Existing stored activities gain previews when fetched in a fresh snapshot, retaining their old “Image view” label. Already cached client snapshots are not invalidated by this change.

Validation:

• 165 focused adapter, activity projection, and shared presentation tests pass.
• Server typecheck passes. Changed-file lint passes with one pre-existing unused import warning.
• T3 Browser panel: reproduced the blank row without the projection fix, then verified the same saved activity renders a 1536 × 1024 image with the fix; opening and closing the full-size viewer works. Used an isolated, reduced copy of a real conversation and cleared its browser thread cache to fetch a fresh snapshot. No new image-generation request was made.
• Web/desktop share the verified rendering path. Mobile uses the same projected metadata and existing preview component; native mobile was not exercised. Other providers are unchanged. Signed environment-relative asset handling is unchanged; remote/relay/tunnel connections were not exercised.
• Two independent source reviews found no defects.

Before	After

Full-size viewer screenshot

Model: GPT-6. Harness: Codex in T3 Code.

Summary by CodeRabbit

• Bug Fixes
  • Generated-image activities are now labeled “Generated image” and can display a preview from a valid saved workspace image path.
  • Image previews remain consistent when activity details are projected repeatedly. Missing, blank, or ordinary file paths do not produce image previews.
  • Completed generated-image activities retain their associated thread and turn details, timestamps, and image information.

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• apps/server/src/provider/Layers/CodexAdapter.test.ts

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📝 Walkthrough

Walkthrough

Codex image-generation events use the title "Generated image". Activity projection exposes a valid generated-image savedPath as data.imagePath without exposing image bytes.

Changes

Generated image activity

Layer / File(s)	Summary
Codex image-generation events apps/server/src/provider/Layers/CodexAdapter.ts, apps/server/src/provider/Layers/CodexAdapter.test.ts	Image-generation events use the title "Generated image". Ordinary image views keep the title "Image view". Tests check the completed event payload, including savedPath.
Generated-image path projection apps/server/src/orchestration/ActivityPayloadProjection.ts, apps/server/src/orchestration/ActivityPayloadProjection.test.ts	Projection uses a valid image-generation savedPath as data.imagePath. Tests cover invalid paths, omitted image bytes, and repeated projection.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: maria-rcks

Merge Risk: ⚪ Minimal · up to 0fa49

Generated-image previews are covered across the adapter and projection paths, with invalid paths and image bytes excluded. No merge-blocking risk is evident.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: preview generated images from saved paths.
Description check	✅ Passed	The description explains what changed and why, includes before-and-after screenshots, and reports validation and testing. It does not use the template headings or include the checklist, but the requir…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
In `@apps/server/src/provider/Layers/CodexAdapter.test.ts`:
- Around line 1241-1294: Update the lifecycle assertion in the “labels Codex
image generation” test to verify that the completed “Generated image” event
preserves the emitted savedPath value in its projected event data. Keep the
existing lifecycle, item-type, and title assertions intact.

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Configuration used: Repository: pingdotgg/t3code/.coderabbit.yaml

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Run ID: 803941a5-dd5c-414f-a85e-53cc9133b8e5

📥 Commits

Reviewing files that changed from the base of the PR and between db898a3 and 8de4527.

📒 Files selected for processing (4)

• apps/server/src/orchestration/ActivityPayloadProjection.test.ts
• apps/server/src/orchestration/ActivityPayloadProjection.ts
• apps/server/src/provider/Layers/CodexAdapter.test.ts
• apps/server/src/provider/Layers/CodexAdapter.ts

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