feat: workspaces/worktrees UX + Environments settings + response-required notifications

[ishanray]

Summary

A bundle of workspace/worktree quality-of-life improvements plus a few UX/polish fixes across threads/messages, collaboration modes, notifications, settings, and the local git diff viewer.

A lot of the things which brings it to feature parity with the Codex app.

Let me know if it is too big and I can break it up into smaller chunks @Dimillian

Key changes

Workspaces / Worktrees

• Copy AGENTS.md from the parent repo into newly-created worktrees (when present).
• Add an option to skip copying AGENTS.md during worktree creation (default remains on).
• Worktree creation prompt: add a branch suggestions dropdown + improved modal styling.
• Composer: enable shortcuts on the workspace home textarea.

Settings

• Add Settings → Environments for per-project setup scripts (stored on the workspace settings).

Environment setup script flow

• Worktree prompt surfaces the setup script (configured in Settings → Environments) and runs it once after worktree creation.

Notifications

• Add “response required” system notifications for agents and wire into the app modal/controller flow.

Collaboration modes / app-server

• Include experimentalApi capability during initialize.
• Accept alternate collaboration mode responses, improve debug logging, and display collaboration modes verbatim.
• Remove unused collaboration mode label formatter utility.

Git diff viewer

• Add per-file discard action in the local diff viewer.
• Improve image diff card support and related diff viewer styling.

Threads / Messages

• Fix: keep streamed plan output visible when completion is empty.
• Refine thread item normalization + add/extend tests around turn events and normalization.

Implementation notes

• Worktree AGENTS.md copy is best-effort: if the parent repo does not have AGENTS.md, creation proceeds normally.
• Skip-copy toggle is plumbed end-to-end (frontend → IPC → app backend → daemon) so remote mode stays consistent.

Test plan

• npm run test
• npm run typecheck
• npm run lint
• cd src-tauri && cargo check

(Manual) Worktree creation:

• Create a worktree with default settings: verify AGENTS.md is copied when present.
• Create a worktree with “Copy AGENTS.md” unchecked: verify it is not copied.

[Dimillian]

Nice! Look like a lot of QoL! Thanks!

[Dimillian]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Skip copying when worktree already has AGENTS.md

This copy path always writes the parent repo’s AGENTS.md into the new worktree without checking whether the checked-out branch already contains its own AGENTS.md. For existing branches, that overwrites branch-specific instructions and immediately leaves the worktree dirty, which can change agent behavior and surprise users right after creation.

Useful? React with 👍 / 👎.

[chatgpt-codex-connector]

Prefer incoming tool output unless it is truly empty

Using output length as the merge rule causes stale content to win whenever the server sends a shorter final update for the same tool item (for example, replacing verbose streamed text with a concise final result or error). In those cases the UI keeps the old longer text and never shows the authoritative completion payload.

Useful? React with 👍 / 👎.

[Dimillian]

Why did you added a manual agents.md copy? New worktree will already have it since they're based on the parent repo, no? Am I missing something?