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 the sidebar and settings UI

• Adds a defaultThreadEnvMode field ('local' | 'worktree', default 'local') to AppSettingsSchema.
• Exposes a new "Threads" section in _chat.settings.tsx with a toggle and restore-default button for this setting.
• Updates Sidebar.tsx to use defaultThreadEnvMode when creating new threads instead of a hardcoded 'local'; the local-new-thread keyboard shortcut continues to force 'local'.
• Adds resolveSidebarNewThreadEnvMode to resolve the env mode using an explicit request or fall back to the app default.
• Behavioral Change: new threads created via project creation and the sidebar button now respect the user-configured default instead of always using 'local'.

^{Macroscope summarized 000ce3a.}

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