Improve object editor asset previews and controls

[Frotty]

Object editor model previews were confined to a tiny single-line badge, choosing another asset required entering edit mode first, and refreshing the detail header could leave its icon spinning. The object action bar also lost its padding because its CSS shorthand expanded to an invalid value.

Model previews now span both value lines at 36px in compact mode and 40px in cozy mode. Editable asset fields offer a direct Browse button, including empty and placeholder values. Refreshed header icons reuse the icon loader, and action buttons have density-aware padding and gaps. Asset field edit and undo/redo cycles target the enclosing table cell, keeping one wrapper; undoing to a placeholder clears the preview.

Validation:

• Webpack build, extension and webview TypeScript checks, ESLint, and npm test passed.
• Initial full browser run: all 130 tests passed.
• Follow-up full browser run: 130 passed; the existing deletion/reindexing test exceeded its 30-second limit. It passed on a targeted rerun with a 60-second limit (38.4 seconds).
• All six final asset-control browser regressions passed, covering direct selection, loaded-icon header refresh, thumbnail size, both density modes, repeated editing/undo/redo, and choosing/saving assets into empty and placeholder fields.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-08T12:28:44.378091Z	b8c34ae	Manual request

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 11fb8c6b3f

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[Frotty]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 3eee88d10a

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[Frotty]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

Reviewed commit: b8c34aece3

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".