feat: add branch/worktree support to mass edit dialog

Implement worktree creation and branch assignment in the mass edit dialog to match the functionality of the add-feature and edit-feature dialogs.

Changes:
- Add WorkModeSelector to mass-edit-dialog.tsx with three modes:
  - 'Current Branch': Work on current branch (no worktree)
  - 'Auto Worktree': Auto-generate branch name and create worktree
  - 'Custom Branch': Use specified branch name and create worktree
- Update handleBulkUpdate in board-view.tsx to:
  - Accept workMode parameter
  - Create worktrees for 'auto' and 'custom' modes
  - Auto-select created worktrees in the board header
  - Handle branch name generation for 'auto' mode
- Add necessary props to MassEditDialog (branchSuggestions, branchCardCounts, currentBranch)

Users can now bulk-assign features to a branch and automatically create/select worktrees, enabling efficient project setup with many features.

Fixes #459

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

apps/ui/src/components/views/board-view/dialogs/mass-edit-dialog.tsx

@@ -13,7 +13,8 @@ import { Label } from '@/components/ui/label';
 import { AlertCircle } from 'lucide-react';
 import { modelSupportsThinking } from '@/lib/utils';
 import { Feature, ModelAlias, ThinkingLevel, PlanningMode } from '@/store/app-store';
-import { TestingTabContent, PrioritySelect, PlanningModeSelect } from '../shared';
+import { TestingTabContent, PrioritySelect, PlanningModeSelect, WorkModeSelector } from '../shared';
+import type { WorkMode } from '../shared';
 import { PhaseModelSelector } from '@/components/views/settings-view/model-defaults/phase-model-selector';
 import { isCursorModel, isClaudeModel, type PhaseModelEntry } from '@automaker/types';
 import { cn } from '@/lib/utils';
@@ -23,7 +24,10 @@ interface MassEditDialogProps {
   open: boolean;
   onClose: () => void;
   selectedFeatures: Feature[];
-  onApply: (updates: Partial<Feature>) => Promise<void>;
+  onApply: (updates: Partial<Feature>, workMode: WorkMode) => Promise<void>;
+  branchSuggestions: string[];
+  branchCardCounts?: Record<string, number>;
+  currentBranch?: string;
 }
 
 interface ApplyState {
@@ -33,6 +37,7 @@ interface ApplyState {
   requirePlanApproval: boolean;
   priority: boolean;
   skipTests: boolean;
+  branchName: boolean;
 }
 
 function getMixedValues(features: Feature[]): Record<string, boolean> {
@@ -47,6 +52,7 @@ function getMixedValues(features: Feature[]): Record<string, boolean> {
     ),
     priority: !features.every((f) => f.priority === first.priority),
     skipTests: !features.every((f) => f.skipTests === first.skipTests),
+    branchName: !features.every((f) => f.branchName === first.branchName),
   };
 }
 
@@ -97,7 +103,15 @@ function FieldWrapper({ label, isMixed, willApply, onApplyChange, children }: Fi
   );
 }
 
-export function MassEditDialog({ open, onClose, selectedFeatures, onApply }: MassEditDialogProps) {
+export function MassEditDialog({
+  open,
+  onClose,
+  selectedFeatures,
+  onApply,
+  branchSuggestions,
+  branchCardCounts,
+  currentBranch,
+}: MassEditDialogProps) {
   const [isApplying, setIsApplying] = useState(false);
 
   // Track which fields to apply
@@ -108,6 +122,7 @@ export function MassEditDialog({ open, onClose, selectedFeatures, onApply }: Mas
     requirePlanApproval: false,
     priority: false,
     skipTests: false,
+    branchName: false,
   });
 
   // Field values
@@ -118,6 +133,18 @@ export function MassEditDialog({ open, onClose, selectedFeatures, onApply }: Mas
   const [priority, setPriority] = useState(2);
   const [skipTests, setSkipTests] = useState(false);
 
+  // Work mode and branch name state
+  const [workMode, setWorkMode] = useState<WorkMode>(() => {
+    // Derive initial work mode from first selected feature's branchName
+    if (selectedFeatures.length > 0 && selectedFeatures[0].branchName) {
+      return 'custom';
+    }
+    return 'current';
+  });
+  const [branchName, setBranchName] = useState(() => {
+    return getInitialValue(selectedFeatures, 'branchName', '') as string;
+  });
+
   // Calculate mixed values
   const mixedValues = useMemo(() => getMixedValues(selectedFeatures), [selectedFeatures]);
 
@@ -131,6 +158,7 @@ export function MassEditDialog({ open, onClose, selectedFeatures, onApply }: Mas
         requirePlanApproval: false,
         priority: false,
         skipTests: false,
+        branchName: false,
       });
       setModel(getInitialValue(selectedFeatures, 'model', 'sonnet') as ModelAlias);
       setThinkingLevel(getInitialValue(selectedFeatures, 'thinkingLevel', 'none') as ThinkingLevel);
@@ -138,6 +166,10 @@ export function MassEditDialog({ open, onClose, selectedFeatures, onApply }: Mas
       setRequirePlanApproval(getInitialValue(selectedFeatures, 'requirePlanApproval', false));
       setPriority(getInitialValue(selectedFeatures, 'priority', 2));
       setSkipTests(getInitialValue(selectedFeatures, 'skipTests', false));
+      // Reset work mode and branch name
+      const initialBranchName = getInitialValue(selectedFeatures, 'branchName', '') as string;
+      setBranchName(initialBranchName);
+      setWorkMode(initialBranchName ? 'custom' : 'current');
     }
   }, [open, selectedFeatures]);
 
@@ -150,6 +182,12 @@ export function MassEditDialog({ open, onClose, selectedFeatures, onApply }: Mas
     if (applyState.requirePlanApproval) updates.requirePlanApproval = requirePlanApproval;
     if (applyState.priority) updates.priority = priority;
     if (applyState.skipTests) updates.skipTests = skipTests;
+    if (applyState.branchName) {
+      // For 'current' mode, use empty string (work on current branch)
+      // For 'auto' mode, use empty string (will be auto-generated)
+      // For 'custom' mode, use the specified branch name
+      updates.branchName = workMode === 'custom' ? branchName : '';
+    }
 
     if (Object.keys(updates).length === 0) {
       onClose();
@@ -158,7 +196,7 @@ export function MassEditDialog({ open, onClose, selectedFeatures, onApply }: Mas
 
     setIsApplying(true);
     try {
-      await onApply(updates);
+      await onApply(updates, workMode);
       onClose();
     } finally {
       setIsApplying(false);
@@ -293,6 +331,25 @@ export function MassEditDialog({ open, onClose, selectedFeatures, onApply }: Mas
               testIdPrefix="mass-edit"
             />
           </FieldWrapper>
+
+          {/* Branch / Work Mode */}
+          <FieldWrapper
+            label="Branch / Work Mode"
+            isMixed={mixedValues.branchName}
+            willApply={applyState.branchName}
+            onApplyChange={(apply) => setApplyState((prev) => ({ ...prev, branchName: apply }))}
+          >
+            <WorkModeSelector
+              workMode={workMode}
+              onWorkModeChange={setWorkMode}
+              branchName={branchName}
+              onBranchNameChange={setBranchName}
+              branchSuggestions={branchSuggestions}
+              branchCardCounts={branchCardCounts}
+              currentBranch={currentBranch}
+              testIdPrefix="mass-edit-work-mode"
+            />
+          </FieldWrapper>
         </div>
 
         <DialogFooter>