feat(board-view): enhance feature and plan dialogs with worktree branch settings

- Added WorktreeSettingsDialog and PlanSettingsDialog components to manage worktree branch settings.
- Integrated new settings into BoardHeader for toggling worktree branch usage in feature creation.
- Updated AddFeatureDialog to utilize selected worktree branch for custom mode.
- Introduced new state management in app-store for handling worktree branch preferences.

These changes improve user control over feature creation workflows by allowing branch selection based on the current worktree context.

apps/ui/src/components/views/board-view.tsx

@@ -101,6 +101,8 @@ export function BoardView() {
     useWorktrees,
     enableDependencyBlocking,
     skipVerificationInAutoMode,
+    planUseSelectedWorktreeBranch,
+    addFeatureUseSelectedWorktreeBranch,
     isPrimaryWorktreeBranch,
     getPrimaryWorktreeBranch,
     setPipelineConfig,
@@ -1370,6 +1372,14 @@ export function BoardView() {
         isMaximized={isMaximized}
         parentFeature={spawnParentFeature}
         allFeatures={hookFeatures}
+        // When setting is enabled and a non-main worktree is selected, pass its branch to default to 'custom' work mode
+        selectedNonMainWorktreeBranch={
+          addFeatureUseSelectedWorktreeBranch && currentWorktreePath !== null
+            ? currentWorktreeBranch || undefined
+            : undefined
+        }
+        // When the worktree setting is disabled, force 'current' branch mode
+        forceCurrentBranchMode={!addFeatureUseSelectedWorktreeBranch}
       />
 
       {/* Edit Feature Dialog */}
@@ -1449,7 +1459,7 @@ export function BoardView() {
         setPendingPlanResult={setPendingBacklogPlan}
         isGeneratingPlan={isGeneratingPlan}
         setIsGeneratingPlan={setIsGeneratingPlan}
-        currentBranch={selectedWorktreeBranch}
+        currentBranch={planUseSelectedWorktreeBranch ? selectedWorktreeBranch : undefined}
       />
 
       {/* Plan Approval Dialog */}