fix(web): add default thread env mode setting

[binbandit]

Summary

• add a persisted app setting for the default draft-thread environment mode
• use that setting when creating new draft threads so users do not need to re-toggle New worktree on each new thread
• add tests covering app-settings persistence and backward-compatible defaults

Why

New draft threads always defaulted to local, even if a user consistently works in New worktree mode. The existing toggle only changed the current draft thread, so users had to repeat the same interaction on every new thread.

The right scope here is app-level persistence, not more draft-local state. That keeps existing thread behavior unchanged, preserves explicit overrides, and only affects brand-new draft thread creation.

Changes

• extend web app settings with defaultThreadEnvMode
• add a Settings toggle under Threads to switch the default between Local and New worktree
• update sidebar new-thread creation to honor the persisted default unless an explicit envMode is already supplied
• add tests for defaulting, invalid persisted values, and persisted worktree mode

UI changes

Validation

• bun run test src/appSettings.test.ts src/composerDraftStore.test.ts in apps/web
• bun fmt
• bun lint
• bun typecheck

Note

Add configurable default thread environment mode setting to web app

• Adds defaultThreadEnvMode ("local" | "worktree", default "local") to appSettings.ts, persisted via AppSettingsSchema.
• Adds a new "Threads" section in settings UI with a toggle and "Restore default" button for this setting.
• Updates thread creation in Sidebar.tsx and the chat.newLocal keyboard shortcut in _chat.tsx to resolve env mode via resolveSidebarNewThreadEnvMode, using the app default instead of a hardcoded value.
• Behavioral Change: the chat.newLocal shortcut no longer hardcodes "local" mode — it now follows the user's configured default.

^{Macroscope summarized 3ec278c.}

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on this repository. Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 282d5b72-39d9-4e4c-bef7-12183b401e60

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

📝 Coding Plan

• Generate coding plan for human review comments

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}