Add default new-thread worktree mode with draft defaults

[notkainoa]

Add a setting to choose the default mode for new threads: Local or New worktree.

What changed

• Added a default new-thread setting: Local or New worktree.

• Unified the sidebar button and chat.new to use the same draft setup logic.

• New worktree now opens as a pending draft and creates the worktree on first send.

• chat.newLocal still always opens a local draft.

• Reopening an unsent draft now preserves its branch and mode.

Local.vs.Worktree.for.new.thread.mp4

Note

Add default new-thread worktree mode with settings toggle and draft defaults

• Introduces buildNewThreadDraftDefaults in threadDraftDefaults.ts to compute envMode and initial branch for new draft threads based on user preference and current git status.
• Adds newThreadUsesNewWorktree (default false) to AppSettingsSchema in appSettings.ts, with a settings UI toggle in _chat.settings.tsx to switch between local and new-worktree modes.
• Refactors handleNewThread in Sidebar.tsx to use computed defaults instead of manual branching/worktree overrides; the chat.newLocal shortcut forces local mode.
• Fixes older persisted settings missing new fields by shallow-merging them with schema defaults on read.
• Behavioral Change: new draft threads now default to local mode unless the user enables the new-worktree setting; the chat.new shortcut no longer accepts explicit branch/worktree overrides.

^{Macroscope summarized c55c17b. (Automatic summaries will resume when PR exits draft mode or review begins).}

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[juliusmarminge]

just merged a different PR doing this (#892) although i do think your settings UI fits more so happy to get that int