feat(app): collapse workspace header button labels on narrow rows

Measure the header row width and hide text labels on the Open,
Scripts, and git action split buttons below 700px so the header
fits without wrapping on split-pane layouts.

packages/app/src/components/git-actions-split-button.tsx

@@ -16,18 +16,25 @@ import type { GitAction, GitActions } from "@/components/git-actions-policy";
 
 interface GitActionsSplitButtonProps {
   gitActions: GitActions;
+  hideLabels?: boolean;
 }
 
-export function GitActionsSplitButton({ gitActions }: GitActionsSplitButtonProps) {
+export function GitActionsSplitButton({
+  gitActions,
+  hideLabels,
+}: GitActionsSplitButtonProps) {
   const { theme } = useUnistyles();
   const toast = useToast();
   const archiveShortcutKeys = useShortcutKeys("archive-worktree");
 
-  const getActionDisplayLabel = useCallback((action: GitAction): string => {
-    if (action.status === "pending") return action.pendingLabel;
-    if (action.status === "success") return action.successLabel;
-    return action.label;
-  }, []);
+  const getActionDisplayLabel = useCallback(
+    (action: GitAction): string => {
+      if (action.status === "pending") return action.pendingLabel;
+      if (action.status === "success") return action.successLabel;
+      return action.label;
+    },
+    [],
+  );
 
   const handleActionSelect = useCallback(
     (action: GitAction) => {
@@ -68,9 +75,11 @@ export function GitActionsSplitButton({ gitActions }: GitActionsSplitButtonProps
             ) : (
               <View style={styles.splitButtonContent}>
                 {gitActions.primary.icon}
-                <Text style={styles.splitButtonText}>
-                  {getActionDisplayLabel(gitActions.primary)}
-                </Text>
+                {!hideLabels && (
+                  <Text style={styles.splitButtonText}>
+                    {getActionDisplayLabel(gitActions.primary)}
+                  </Text>
+                )}
               </View>
             )}
           </Pressable>