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/dialogs/worktree-settings-dialog.tsx

@@ -0,0 +1,67 @@
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog';
+import { Label } from '@/components/ui/label';
+import { Switch } from '@/components/ui/switch';
+import { GitBranch, Settings2 } from 'lucide-react';
+
+interface WorktreeSettingsDialogProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  addFeatureUseSelectedWorktreeBranch: boolean;
+  onAddFeatureUseSelectedWorktreeBranchChange: (value: boolean) => void;
+}
+
+export function WorktreeSettingsDialog({
+  open,
+  onOpenChange,
+  addFeatureUseSelectedWorktreeBranch,
+  onAddFeatureUseSelectedWorktreeBranchChange,
+}: WorktreeSettingsDialogProps) {
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="sm:max-w-md" data-testid="worktree-settings-dialog">
+        <DialogHeader>
+          <DialogTitle className="flex items-center gap-2">
+            <Settings2 className="w-5 h-5" />
+            Worktree Settings
+          </DialogTitle>
+          <DialogDescription>
+            Configure how worktrees affect feature creation and organization.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="space-y-4 py-4">
+          {/* Use Selected Worktree Branch Setting */}
+          <div className="flex items-start space-x-3 p-3 rounded-lg bg-secondary/50">
+            <div className="flex-1 space-y-1">
+              <div className="flex items-center justify-between">
+                <Label
+                  htmlFor="worktree-branch-toggle"
+                  className="text-sm font-medium cursor-pointer flex items-center gap-2"
+                >
+                  <GitBranch className="w-4 h-4 text-brand-500" />
+                  Use selected worktree branch
+                </Label>
+                <Switch
+                  id="worktree-branch-toggle"
+                  checked={addFeatureUseSelectedWorktreeBranch}
+                  onCheckedChange={onAddFeatureUseSelectedWorktreeBranchChange}
+                  data-testid="worktree-branch-toggle"
+                />
+              </div>
+              <p className="text-xs text-muted-foreground leading-relaxed">
+                When enabled, the Add Feature dialog will default to custom branch mode with the
+                currently selected worktree branch pre-filled.
+              </p>
+            </div>
+          </div>
+        </div>
+      </DialogContent>
+    </Dialog>
+  );
+}