fix(web): close the GUI update feedback loop

apps/web/tests/vite-entry.e2e.ts

@@ -0,0 +1,29 @@
+/** Bare Vite must fail before it can present a bootless shell as a working GUI. */
+
+import { fileURLToPath } from 'node:url'
+import { join } from 'node:path'
+import { execa } from 'execa'
+import { describe, expect, it } from 'vitest'
+
+const WEB_ROOT = fileURLToPath(new URL('..', import.meta.url))
+
+describe('Web development entry', () => {
+  it('rejects the package dev alias with the full-host correction', async () => {
+    const result = await execa('pnpm', ['run', 'dev'], { cwd: WEB_ROOT, reject: false })
+    expect(result.exitCode).not.toBe(0)
+    expect(result.stderr).toContain('apps/web is build-only')
+    expect(result.stderr).toContain('dsh web')
+  })
+
+  it('rejects the standalone Vite server with the full-host correction', async () => {
+    const result = await execa(join(WEB_ROOT, 'node_modules/.bin/vite'), ['--host', '127.0.0.1', '--port', '0'], {
+      cwd: WEB_ROOT,
+      reject: false,
+      timeout: 2_000,
+    })
+    expect(result.exitCode).not.toBe(0)
+    expect(result.stderr).toContain('apps/web is not a standalone application')
+    expect(result.stderr).toContain('dsh web')
+    expect(result.stderr).toContain('window.__DSH_BOOT__')
+  })
+})