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/page_check_ai/test_ai_shared.py

@@ -0,0 +1,19 @@
+"""Everything from the no-AI page: the no-AI contract cases, run unchanged against the AI page.
+
+They use this folder's `page` and `push` fixtures, so they check the React page.
+"""
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "page_check"))
+
+from test_contract import (  # noqa: E402,F401
+    test_dark_toggle_flips_theme,
+    test_donut_and_legend_match_batch_states,
+    test_kpi_counts_match_batch_states,
+    test_log_lines_show_their_type,
+    test_no_bot_page_runs_on_sample_data,
+    test_plain_browser_first_open_shows_sample_data,
+    test_report_search_filters_rows_and_shows_bucket_pill,
+    test_step_list_follows_step_label,
+)