fix(web): render local images inline

[berend]

Problem

Local workspace images referenced in chat Markdown render as broken placeholders, even though the same paths work as file links. Image generation and view_image also provide local paths that were not surfaced as visible image output.

Fixes #2398.

Fix

• Resolve supported relative, absolute, and file:// workspace image sources through T3 Code's existing signed asset URLs.
• Preserve Codex imageGeneration.savedPath and imageView.path lifecycle data and render those outputs inline in the work log.
• Keep remote image rendering and existing workspace file-link behavior unchanged.
• Add focused coverage for Markdown image resolution, Codex lifecycle mapping, and web work-log derivation.

This reuses the existing workspace asset boundary: paths are resolved against the thread workspace and served through expiring signed URLs instead of exposing raw local-file URLs.

Screenshots

The screenshots for generated image output and workspace images rendered through Markdown were captured with a local development build and will be attached separately.

Validation

• pnpm exec vp test run apps/web/src/markdown-links.test.ts apps/web/src/session-logic.test.ts apps/server/src/provider/Layers/CodexAdapter.test.ts — 122 tests passed
• pnpm exec vp run --filter @t3tools/web typecheck
• pnpm exec vp run --filter t3 typecheck
• Manual local development build verification for relative Markdown images, file links, remote images, Codex image generation, and view_image

you can see the before in the linked issue

Checklist

• This PR is small and focused
• I explained what changed and why
• I included screenshots for the UI changes
• A video is not applicable because there are no animation or interaction changes

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🤖 Implementation and tests were generated with OpenAI Codex (GPT-5.6 Sol) through the T3 Code Codex harness, then reviewed and verified in a local development build.

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Note

Low Risk
UI and asset-display changes reusing the existing signed workspace-file boundary; no auth or persistence changes.

Overview
Fixes broken local image placeholders by routing workspace image paths through the existing signed asset URL flow instead of raw file: URLs.

Chat Markdown adds resolveMarkdownImageFileLinkMeta and a MarkdownWorkspaceImage component that resolves relative, absolute, and file:// image sources against the thread workspace. The sanitize schema now allows file: on img src; remote images are unchanged.

Work log derives an imagePath on image_view entries from Codex savedPath/path, Claude file lists, and image-like details, then renders inline previews under the row via ChatMarkdown. Server keeps savedPath in activity payload projection and maps Codex savedPath into lifecycle detail.

Clipboard stores the original markdown source on data-markdown-src so copy/paste round-trips workspace paths (including encoded Windows paths) rather than expiring signed URLs.

^{Reviewed by Cursor Bugbot for commit b9f2090. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Render local workspace images inline in chat work log entries

• Adds MarkdownWorkspaceImage component in ChatMarkdown.tsx that resolves workspace file paths to signed asset URLs and renders them inline, with loading/error fallbacks.
• Extends SimpleWorkEntryRow in MessagesTimeline.tsx to display an inline image when workEntry.imagePath is set and a threadRef is available.
• Adds imagePath to WorkLogEntry in session-logic.ts, derived from item.savedPath, item.path, changedFiles, or payload.detail for image_view activities.
• Updates clipboard serialization in markdown-clipboard.ts to use the original markdown source (via data-markdown-src) rather than signed URLs when copying images.
• Extends ActivityPayloadProjection to retain savedPath through payload projection so image paths survive to the frontend.

^{Macroscope summarized b9f2090.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new feature enabling inline rendering of local workspace images. It adds new user-facing behavior with a new component that fetches signed asset URLs, touches multiple layers (server projection, web rendering, clipboard handling), and warrants human review to verify the integration across these components.

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[karimou5]

Tested this PR locally and it fixed the issue for me.

Environment: Ubuntu 24.04.4 LTS (Debian-based), x86_64, kernel 7.0.0-28-generic, T3 Code AppImage. I built PR head c0559ff together with an unrelated local preview screenshot patch.

Both local Markdown images and view_image output now render inline correctly. The targeted test suite also passed: 218 tests.

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