diff --git a/AGENTS.md b/AGENTS.md
index ed08baa..5830bb4 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -28,9 +28,13 @@ Standard commands live in `CONTRIBUTING.md` and `package.json` scripts (`npm run
- `npm run dev` runs the Express API (`:3001`) and Vite UI (`:5173`) together; open the
UI at http://localhost:5173. API liveness: `GET http://localhost:3001/api/health`
→ `{"ok":true}`. Default mode is single-user (no login).
-- Vite is configured with `server.host: true` and `server.allowedHosts: true` so
- `http://127.0.0.1:5173` works (not only IPv6 localhost) and Cursor/cloud
+- Vite is configured with `server.host: true`, `server.strictPort: true`, and
+ `server.allowedHosts: true` so `http://127.0.0.1:5173` works (not only IPv6
+ localhost), the port does not silently hop to 5174+, and Cursor/cloud
port-forward Host headers are not rejected with 403 (which looks like a blank page).
+- `apps/web/index.html` paints a dark `#020617` shell inline before JS/CSS so a
+ hung module graph never shows a white page. If the embedded preview is still
+ pure white while Playwright/`curl` see the UI, hard-refresh the preview panel.
- Vite prints a "Failed to run dependency scan … monaco-editor/esm/…" warning on startup.
It is **non-fatal** — Monaco is installed and the SQL editor works; ignore it.
diff --git a/apps/web/index.html b/apps/web/index.html
index ac23680..77cd1c3 100644
--- a/apps/web/index.html
+++ b/apps/web/index.html
@@ -1,10 +1,14 @@
-
+
Fox Schema
+
+
diff --git a/apps/web/vite.config.ts b/apps/web/vite.config.ts
index cb49aaa..3c5f09a 100644
--- a/apps/web/vite.config.ts
+++ b/apps/web/vite.config.ts
@@ -28,6 +28,8 @@ export default defineConfig({
// makes http://127.0.0.1:5173 fail with ERR_CONNECTION_REFUSED.
host: true,
port: 5173,
+ // Don't silently hop to 5174+ — Cursor / agent previews pin :5173.
+ strictPort: true,
// Cursor / cloud port-forwards send a non-localhost Host header; Vite 8
// rejects those with 403 ("Blocked request…") → blank page in the browser.
allowedHosts: true,