fix: preserve configurable worktree branch prefixes

[nassimna]

What Changed

• Added a configurable worktreeBranchPrefix setting.
• Used that prefix when creating temporary worktree branches.
• Preserved the prefix during server-side generated branch renames.
• Added schema, migration, and test coverage for the new setting.

Why

• Users with a non-t3code branch namespace should not have generated worktree renames rewritten back to t3code/....
• This keeps branch naming predictable across settings, worktree creation, retries, and rename handling.

UI Changes

• This adds a visible settings control for the worktree branch prefix.
  
  

Verification

• bun fmt
• bun lint
• bun typecheck

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Note

Medium Risk
Touches branch-name generation/detection and server-side git rename behavior; a regex or prefix-handling mistake could rename the wrong branch or break worktree flows for some users, but changes are localized and covered by tests.

Overview
Ensures worktree branch naming is prefix-configurable end-to-end: a new worktreeBranchPrefix client setting (validated/normalized via WorktreeBranchPrefix, defaulting to t3code) is introduced and migrated from legacy local settings.

Temporary worktree branches are now created as ${prefix}/worktree-<8hex> instead of a hardcoded t3code/<8hex>, and server-side first-turn rename logic now detects only these marked temp branches (case-insensitive) and preserves the existing prefix when generating the final branch name. Adds UI control + validation for editing the prefix and expands test coverage for temp-branch detection and rename behavior.

^{Written by Cursor Bugbot for commit a9fed1c. This will update automatically on new commits. Configure here.}

Note

Preserve configurable worktree branch prefixes when renaming and creating branches

• Adds a worktreeBranchPrefix field to ClientSettingsSchema (default t3code) with a WorktreeBranchPrefix schema for validation and normalization in settings.ts.
• Exposes a UI control in SettingsPanels.tsx so users can view, edit, and reset their worktree branch prefix.
• Updates ChatView.logic.ts and ChatView.tsx to pass the configured prefix into buildTemporaryWorktreeBranchName, producing branches in the form <prefix>/worktree-<8hex>.
• Updates ProviderCommandReactor.ts to extract the prefix from the existing branch and pass it to buildGeneratedWorktreeBranchName on rename, so the namespace is preserved across the rename.
• Behavioral Change: temporary and renamed worktree branches now include a /worktree- marker segment; existing branches without this marker will not match the new TEMP_WORKTREE_BRANCH_PATTERN and won't be renamed.

^{Macroscope summarized a9fed1c.}

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