Add branch switch to mobile worktree panel

apps/ui/src/components/views/board-view/worktree-panel/components/branch-switch-dropdown.tsx

@@ -20,6 +20,8 @@ interface BranchSwitchDropdownProps {
   branchFilter: string;
   isLoadingBranches: boolean;
   isSwitching: boolean;
+  /** When true, renders as a standalone button (not attached to another element) */
+  standalone?: boolean;
   onOpenChange: (open: boolean) => void;
   onFilterChange: (value: string) => void;
   onSwitchBranch: (worktree: WorktreeInfo, branchName: string) => void;
@@ -33,6 +35,7 @@ export function BranchSwitchDropdown({
   branchFilter,
   isLoadingBranches,
   isSwitching,
+  standalone = false,
   onOpenChange,
   onFilterChange,
   onSwitchBranch,
@@ -42,16 +45,18 @@ export function BranchSwitchDropdown({
     <DropdownMenu onOpenChange={onOpenChange}>
       <DropdownMenuTrigger asChild>
         <Button
-          variant={isSelected ? 'default' : 'outline'}
+          variant={standalone ? 'outline' : isSelected ? 'default' : 'outline'}
           size="sm"
           className={cn(
-            'h-7 w-7 p-0 rounded-none border-r-0',
-            isSelected && 'bg-primary text-primary-foreground',
-            !isSelected && 'bg-secondary/50 hover:bg-secondary'
+            'h-7 w-7 p-0',
+            !standalone && 'rounded-none border-r-0',
+            standalone && 'h-8 w-8 shrink-0',
+            !standalone && isSelected && 'bg-primary text-primary-foreground',
+            !standalone && !isSelected && 'bg-secondary/50 hover:bg-secondary'
           )}
           title="Switch branch"
         >
-          <GitBranch className="w-3 h-3" />
+          <GitBranch className={standalone ? 'w-3.5 h-3.5' : 'w-3 h-3'} />
         </Button>
       </DropdownMenuTrigger>
       <DropdownMenuContent align="start" className="w-64">

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

@@ -13,7 +13,12 @@ import {
   useWorktreeActions,
   useRunningFeatures,
 } from './hooks';
-import { WorktreeTab, WorktreeMobileDropdown, WorktreeActionsDropdown } from './components';
+import {
+  WorktreeTab,
+  WorktreeMobileDropdown,
+  WorktreeActionsDropdown,
+  BranchSwitchDropdown,
+} from './components';
 
 export function WorktreePanel({
   projectPath,
@@ -186,6 +191,24 @@ export function WorktreePanel({
           onSelectWorktree={handleSelectWorktree}
         />
 
+        {/* Branch switch dropdown for the selected worktree */}
+        {selectedWorktree && (
+          <BranchSwitchDropdown
+            worktree={selectedWorktree}
+            isSelected={true}
+            standalone={true}
+            branches={branches}
+            filteredBranches={filteredBranches}
+            branchFilter={branchFilter}
+            isLoadingBranches={isLoadingBranches}
+            isSwitching={isSwitching}
+            onOpenChange={handleBranchDropdownOpenChange(selectedWorktree)}
+            onFilterChange={setBranchFilter}
+            onSwitchBranch={handleSwitchBranch}
+            onCreateBranch={onCreateBranch}
+          />
+        )}
+
         {/* Actions menu for the selected worktree */}
         {selectedWorktree && (
           <WorktreeActionsDropdown