test(terminal): support local browser bench runs

README.md

@@ -21,16 +21,22 @@ Change `app_config/src/lib.rs` to test another base path.
 The terminal benchmark script connects to an already-running dev server; it does
 not start or stop services.
 
-Install the Node dependency and Chromium browser once before running it:
+Install the Node dependency once before running it:
 
 ```bash
 npm install
-npx playwright install chromium
 ```
 
 ```bash
 npm run terminal:bench -- --url http://127.0.0.1:3100/rustui/terminal
 ```
 
+If Playwright's browser download is slow, use an installed Chrome/Chromium
+instead:
+
+```bash
+npm run terminal:bench -- --url http://127.0.0.1:3100/rustui/terminal --browser-executable /usr/bin/google-chrome
+```
+
 It writes `target/terminal-bench/terminal-bench.json` plus screenshots when
 Playwright is available in the workspace.