AI web starter: bands, review split pane, approve gate, server stub (checkpoint)

React + Vite + Tailwind starter with the no-AI shell, band legend, review
split pane with drafts and verify, and a server stub that refuses approval
while flagged fields are unverified. Band self-check and AI page check.
Both page checks share one Chromium via tests/conftest.py.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/conftest.py

@@ -0,0 +1,12 @@
+"""Shared by both page checks: one headless Chromium for the whole run
+(Playwright's sync API allows only one instance per process)."""
+import pytest
+from playwright.sync_api import sync_playwright
+
+
+@pytest.fixture(scope="session")
+def browser():
+    with sync_playwright() as p:
+        b = p.chromium.launch()
+        yield b
+        b.close()