fix: chrome dev tools mcp

hosts/nb/modules/development/mcp-chromium.nix

@@ -46,7 +46,24 @@ in
   environment.etc."codex/config.toml".text = ''
     [mcp_servers.chrome-devtools]
     command = "npx"
-    args = ["-y", "chrome-devtools-mcp@latest", "--browserUrl=http://127.0.0.1:9222"]
+    args = [
+      # "-y", "chrome-devtools-mcp@latest", "--browserUrl=http://127.0.0.1:9222"
+      "-y", "chrome-devtools-mcp@latest",
+
+      # Tell MCP exactly which Chromium to launch (Nix store path)
+      "--executablePath=${pkgs.ungoogled-chromium}/bin/chromium",
+
+      # Make every run use a temporary profile (no shared state)
+      "--isolated=true",
+
+      # Headful by default on Wayland
+      "--headless=true",
+
+      # Pass Chromium flags for Wayland + scale
+      "--chromeArg=--ozone-platform=wayland",
+      "--chromeArg=--enable-features=UseOzonePlatform",
+      "--chromeArg=--force-device-scale-factor=1"
+    ]
     startup_timeout_sec = 30
     tool_timeout_sec = 120
   '';