refactor: update terminology in board view components

- Renamed "Worktrees" to "Worktree Bar" in the BoardHeader component for clarity.
- Updated comments and labels in AddFeatureDialog, PlanSettingsDialog, and WorktreeSettingsDialog to reflect the new terminology and improve user understanding of worktree mode functionality.

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

@@ -138,7 +138,7 @@ export function BoardHeader({
           <div className={controlContainerClass} data-testid="worktrees-toggle-container">
             <GitBranch className="w-4 h-4 text-muted-foreground" />
             <Label htmlFor="worktrees-toggle" className="text-sm font-medium cursor-pointer">
-              Worktrees
+              Worktree Bar
             </Label>
             <Switch
               id="worktrees-toggle"

apps/ui/src/components/views/board-view/dialogs/add-feature-dialog.tsx

@@ -123,7 +123,7 @@ interface AddFeatureDialogProps {
   selectedNonMainWorktreeBranch?: string;
   /**
    * When true, forces the dialog to default to 'current' work mode (work on current branch).
-   * This is used when the "Use selected worktree branch" setting is disabled.
+   * This is used when the "Default to worktree mode" setting is disabled.
    */
   forceCurrentBranchMode?: boolean;
 }

apps/ui/src/components/views/board-view/dialogs/plan-settings-dialog.tsx

@@ -45,7 +45,7 @@ export function PlanSettingsDialog({
                   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
+                  Default to worktree mode
                 </Label>
                 <Switch
                   id="plan-worktree-branch-toggle"
@@ -55,8 +55,8 @@ export function PlanSettingsDialog({
                 />
               </div>
               <p className="text-xs text-muted-foreground leading-relaxed">
-                When enabled, features created via the Plan dialog will be assigned to the currently
-                selected worktree branch. When disabled, features will be added to the main branch.
+                Planned features will automatically use isolated worktrees, keeping changes separate
+                from your main branch until you're ready to merge.
               </p>
             </div>
           </div>

apps/ui/src/components/views/board-view/dialogs/worktree-settings-dialog.tsx

@@ -45,7 +45,7 @@ export function WorktreeSettingsDialog({
                   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
+                  Default to worktree mode
                 </Label>
                 <Switch
                   id="worktree-branch-toggle"
@@ -55,8 +55,8 @@ export function WorktreeSettingsDialog({
                 />
               </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.
+                New features will automatically use isolated worktrees, keeping changes separate
+                from your main branch until you're ready to merge.
               </p>
             </div>
           </div>