Tests: stabilize file watchers

src/canvas-host/server.test.ts

@@ -231,7 +231,7 @@ describe("canvas host", () => {
       await server.close();
       await fs.rm(dir, { recursive: true, force: true });
     }
-  });
+  }, 10_000);
 
   it("serves the gateway-hosted A2UI scaffold", async () => {
     const dir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-canvas-"));

src/canvas-host/server.ts

@@ -271,6 +271,7 @@ export async function createCanvasHostHandler(
     ? chokidar.watch(rootReal, {
         ignoreInitial: true,
         awaitWriteFinish: { stabilityThreshold: 75, pollInterval: 10 },
+        usePolling: opts.allowInTests === true,
         ignored: [
           /(^|[\\/])\../, // dotfiles
           /(^|[\\/])node_modules([\\/]|$)/,