Merge main into refactor/frontend

Merge latest features from main including:
- PR #161 (worktree-confusion): Clarified branch handling in dialogs
- PR #160 (speckits-rebase): Planning mode functionality

Resolved conflicts:
- add-feature-dialog.tsx: Combined TanStack Router navigation with branch selection state
- worktree-integration.spec.ts: Updated tests for new worktree behavior (created at execution time)
- package-lock.json: Regenerated after merge

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/components/views/board-view/dialogs/follow-up-dialog.tsx

@@ -57,7 +57,7 @@ export function FollowUpDialog({
       <DialogContent
         compact={!isMaximized}
         data-testid="follow-up-dialog"
-        onKeyDown={(e) => {
+        onKeyDown={(e: React.KeyboardEvent) => {
           if ((e.metaKey || e.ctrlKey) && e.key === "Enter" && prompt.trim()) {
             e.preventDefault();
             onSend();