fix(coding-agent): handle async fs.watch error events in theme watcher

closes #2791

packages/coding-agent/src/modes/interactive/theme/theme.ts

@@ -798,6 +798,14 @@ function startThemeWatcher(): void {
 			}
 			scheduleReload();
 		});
+		themeWatcher.on("error", () => {
+			try {
+				themeWatcher?.close();
+			} catch {
+				/* ignore */
+			}
+			themeWatcher = undefined;
+		});
 	} catch (_error) {
 		// Ignore errors starting watcher
 	}