feat: Implement responsive mobile header layout with menu consolidation

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

@@ -1,3 +1,4 @@
 export { BranchSwitchDropdown } from './branch-switch-dropdown';
 export { WorktreeActionsDropdown } from './worktree-actions-dropdown';
+export { WorktreeMobileDropdown } from './worktree-mobile-dropdown';
 export { WorktreeTab } from './worktree-tab';

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

@@ -44,6 +44,8 @@ interface WorktreeActionsDropdownProps {
   isDevServerRunning: boolean;
   devServerInfo?: DevServerInfo;
   gitRepoStatus: GitRepoStatus;
+  /** When true, renders as a standalone button (not attached to another element) */
+  standalone?: boolean;
   onOpenChange: (open: boolean) => void;
   onPull: (worktree: WorktreeInfo) => void;
   onPush: (worktree: WorktreeInfo) => void;
@@ -71,6 +73,7 @@ export function WorktreeActionsDropdown({
   isDevServerRunning,
   devServerInfo,
   gitRepoStatus,
+  standalone = false,
   onOpenChange,
   onPull,
   onPush,
@@ -115,15 +118,17 @@ export function WorktreeActionsDropdown({
     <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-l-none',
-            isSelected && 'bg-primary text-primary-foreground',
-            !isSelected && 'bg-secondary/50 hover:bg-secondary'
+            'h-7 w-7 p-0',
+            !standalone && 'rounded-l-none',
+            standalone && 'h-8 w-8 shrink-0',
+            !standalone && isSelected && 'bg-primary text-primary-foreground',
+            !standalone && !isSelected && 'bg-secondary/50 hover:bg-secondary'
           )}
         >
-          <MoreHorizontal className="w-3 h-3" />
+          <MoreHorizontal className="w-3.5 h-3.5" />
         </Button>
       </DropdownMenuTrigger>
       <DropdownMenuContent align="start" className="w-56">

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

@@ -0,0 +1,112 @@
+import { Button } from '@/components/ui/button';
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuLabel,
+  DropdownMenuSeparator,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu';
+import { GitBranch, ChevronDown, Loader2, CircleDot, Check } from 'lucide-react';
+import { cn } from '@/lib/utils';
+import type { WorktreeInfo } from '../types';
+
+interface WorktreeMobileDropdownProps {
+  worktrees: WorktreeInfo[];
+  isWorktreeSelected: (worktree: WorktreeInfo) => boolean;
+  hasRunningFeatures: (worktree: WorktreeInfo) => boolean;
+  isActivating: boolean;
+  branchCardCounts?: Record<string, number>;
+  onSelectWorktree: (worktree: WorktreeInfo) => void;
+}
+
+export function WorktreeMobileDropdown({
+  worktrees,
+  isWorktreeSelected,
+  hasRunningFeatures,
+  isActivating,
+  branchCardCounts,
+  onSelectWorktree,
+}: WorktreeMobileDropdownProps) {
+  // Find the currently selected worktree to display in the trigger
+  const selectedWorktree = worktrees.find((w) => isWorktreeSelected(w));
+  const displayBranch = selectedWorktree?.branch || 'Select branch';
+
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>
+        <Button
+          variant="outline"
+          size="sm"
+          className="h-8 px-3 gap-2 font-mono text-xs bg-secondary/50 hover:bg-secondary flex-1 min-w-0"
+          disabled={isActivating}
+        >
+          <GitBranch className="w-3.5 h-3.5 shrink-0" />
+          <span className="truncate">{displayBranch}</span>
+          {isActivating ? (
+            <Loader2 className="w-3 h-3 animate-spin shrink-0" />
+          ) : (
+            <ChevronDown className="w-3 h-3 shrink-0 ml-auto" />
+          )}
+        </Button>
+      </DropdownMenuTrigger>
+      <DropdownMenuContent align="start" className="w-64 max-h-80 overflow-y-auto">
+        <DropdownMenuLabel className="text-xs font-normal text-muted-foreground">
+          Branches & Worktrees
+        </DropdownMenuLabel>
+        <DropdownMenuSeparator />
+        {worktrees.map((worktree) => {
+          const isSelected = isWorktreeSelected(worktree);
+          const isRunning = hasRunningFeatures(worktree);
+          const cardCount = branchCardCounts?.[worktree.branch];
+          const hasChanges = worktree.hasChanges;
+          const changedFilesCount = worktree.changedFilesCount;
+
+          return (
+            <DropdownMenuItem
+              key={worktree.path}
+              onClick={() => onSelectWorktree(worktree)}
+              className={cn('flex items-center gap-2 cursor-pointer', isSelected && 'bg-accent')}
+            >
+              <div className="flex items-center gap-2 flex-1 min-w-0">
+                {isSelected ? (
+                  <Check className="w-3.5 h-3.5 shrink-0 text-primary" />
+                ) : (
+                  <div className="w-3.5 h-3.5 shrink-0" />
+                )}
+                {isRunning && <Loader2 className="w-3 h-3 animate-spin shrink-0" />}
+                <span className={cn('font-mono text-xs truncate', isSelected && 'font-medium')}>
+                  {worktree.branch}
+                </span>
+                {worktree.isMain && (
+                  <span className="text-[10px] px-1 py-0.5 rounded bg-muted text-muted-foreground shrink-0">
+                    main
+                  </span>
+                )}
+              </div>
+              <div className="flex items-center gap-1.5 shrink-0">
+                {cardCount !== undefined && cardCount > 0 && (
+                  <span className="inline-flex items-center justify-center h-4 min-w-[1rem] px-1 text-[10px] font-medium rounded bg-background/80 text-foreground border border-border">
+                    {cardCount}
+                  </span>
+                )}
+                {hasChanges && (
+                  <span
+                    className={cn(
+                      'inline-flex items-center justify-center h-4 min-w-[1rem] px-1 text-[10px] font-medium rounded border',
+                      'bg-amber-500/20 text-amber-600 dark:text-amber-400 border-amber-500/30'
+                    )}
+                    title={`${changedFilesCount ?? 'Some'} uncommitted file${changedFilesCount !== 1 ? 's' : ''}`}
+                  >
+                    <CircleDot className="w-2.5 h-2.5 mr-0.5" />
+                    {changedFilesCount ?? '!'}
+                  </span>
+                )}
+              </div>
+            </DropdownMenuItem>
+          );
+        })}
+      </DropdownMenuContent>
+    </DropdownMenu>
+  );
+}

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

@@ -4,6 +4,7 @@ import { GitBranch, Plus, RefreshCw } from 'lucide-react';
 import { cn, pathsEqual } from '@/lib/utils';
 import { toast } from 'sonner';
 import { getHttpApiClient } from '@/lib/http-api-client';
+import { useIsMobile } from '@/hooks/use-media-query';
 import type { WorktreePanelProps, WorktreeInfo } from './types';
 import {
   useWorktrees,
@@ -12,7 +13,7 @@ import {
   useWorktreeActions,
   useRunningFeatures,
 } from './hooks';
-import { WorktreeTab } from './components';
+import { WorktreeTab, WorktreeMobileDropdown, WorktreeActionsDropdown } from './components';
 
 export function WorktreePanel({
   projectPath,
@@ -103,6 +104,8 @@ export function WorktreePanel({
     checkInitScript();
   }, [projectPath]);
 
+  const isMobile = useIsMobile();
+
   // Periodic interval check (5 seconds) to detect branch changes on disk
   // Reduced from 1s to 5s to minimize GPU/CPU usage from frequent re-renders
   const intervalRef = useRef<NodeJS.Timeout | null>(null);
@@ -167,6 +170,85 @@ export function WorktreePanel({
   const mainWorktree = worktrees.find((w) => w.isMain);
   const nonMainWorktrees = worktrees.filter((w) => !w.isMain);
 
+  // Mobile view: single dropdown for all worktrees
+  if (isMobile) {
+    // Find the currently selected worktree for the actions menu
+    const selectedWorktree = worktrees.find((w) => isWorktreeSelected(w)) || mainWorktree;
+
+    return (
+      <div className="flex items-center gap-2 px-3 py-2 border-b border-border bg-glass/50 backdrop-blur-sm">
+        <WorktreeMobileDropdown
+          worktrees={worktrees}
+          isWorktreeSelected={isWorktreeSelected}
+          hasRunningFeatures={hasRunningFeatures}
+          isActivating={isActivating}
+          branchCardCounts={branchCardCounts}
+          onSelectWorktree={handleSelectWorktree}
+        />
+
+        {/* Actions menu for the selected worktree */}
+        {selectedWorktree && (
+          <WorktreeActionsDropdown
+            worktree={selectedWorktree}
+            isSelected={true}
+            standalone={true}
+            aheadCount={aheadCount}
+            behindCount={behindCount}
+            isPulling={isPulling}
+            isPushing={isPushing}
+            isStartingDevServer={isStartingDevServer}
+            isDevServerRunning={isDevServerRunning(selectedWorktree)}
+            devServerInfo={getDevServerInfo(selectedWorktree)}
+            gitRepoStatus={gitRepoStatus}
+            onOpenChange={handleActionsDropdownOpenChange(selectedWorktree)}
+            onPull={handlePull}
+            onPush={handlePush}
+            onOpenInEditor={handleOpenInEditor}
+            onCommit={onCommit}
+            onCreatePR={onCreatePR}
+            onAddressPRComments={onAddressPRComments}
+            onResolveConflicts={onResolveConflicts}
+            onDeleteWorktree={onDeleteWorktree}
+            onStartDevServer={handleStartDevServer}
+            onStopDevServer={handleStopDevServer}
+            onOpenDevServerUrl={handleOpenDevServerUrl}
+          />
+        )}
+
+        {useWorktreesEnabled && (
+          <>
+            <Button
+              variant="ghost"
+              size="sm"
+              className="h-8 w-8 p-0 text-muted-foreground hover:text-foreground shrink-0"
+              onClick={onCreateWorktree}
+              title="Create new worktree"
+            >
+              <Plus className="w-4 h-4" />
+            </Button>
+
+            <Button
+              variant="ghost"
+              size="sm"
+              className="h-8 w-8 p-0 text-muted-foreground hover:text-foreground shrink-0"
+              onClick={async () => {
+                const removedWorktrees = await fetchWorktrees();
+                if (removedWorktrees && removedWorktrees.length > 0 && onRemovedWorktrees) {
+                  onRemovedWorktrees(removedWorktrees);
+                }
+              }}
+              disabled={isLoading}
+              title="Refresh worktrees"
+            >
+              <RefreshCw className={cn('w-3.5 h-3.5', isLoading && 'animate-spin')} />
+            </Button>
+          </>
+        )}
+      </div>
+    );
+  }
+
+  // Desktop view: full tabs layout
   return (
     <div className="flex items-center gap-2 px-4 py-2 border-b border-border bg-glass/50 backdrop-blur-sm">
       <GitBranch className="w-4 h-4 text-muted-foreground" />