feat: a shorter help bar: reveal or hide as it will, share, no note

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/app/app_test.go

@@ -988,9 +988,14 @@ func TestRebindingShowsEverywhere(t *testing.T) {
 	if !strings.Contains(scr, "z to reveal") || strings.Contains(scr, "space to reveal") {
 		t.Errorf("detail hint doesn't follow the binding:\n%s", scr)
 	}
-	if !strings.Contains(lastLine(scr), "z reveal/hide") {
+	if !strings.Contains(lastLine(scr), "z reveal") || strings.Contains(lastLine(scr), "reveal/hide") {
 		t.Errorf("help bar: %q", lastLine(scr))
 	}
+	d.keys("z")
+	if bar := lastLine(d.screen()); !strings.Contains(bar, "z hide") {
+		t.Errorf("help bar with the value shown: %q", bar)
+	}
+	d.keys("z")
 	if strings.Contains(scr, "to browse") {
 		t.Errorf("hint for unbound versions:\n%s", scr)
 	}