Rewrite frontend site identity, version stamp, and Excel export.

Changelog remains the source of APP_VERSION via overlay sync-version.mjs.

tests/test_periscope_frontend_site_rewrite.py

@@ -0,0 +1,47 @@
+"""Native frontend site/version/export modules live under periscope/src."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+SRC = ROOT / "periscope" / "src" / "frontend"
+
+
+def test_site_version_export_are_src():
+    for rel in (
+        "src/lib/site.ts",
+        "src/lib/version.ts",
+        "src/lib/report-export.ts",
+        "scripts/sync-version.mjs",
+    ):
+        path = SRC / rel
+        assert path.is_file(), rel
+        assert "Native Periscope overlay" not in path.read_text(encoding="utf-8")[:400]
+
+
+def test_site_exports():
+    text = (SRC / "src/lib/site.ts").read_text(encoding="utf-8")
+    for name in (
+        "SITE_URL",
+        "SITE_NAME",
+        "SITE_DESCRIPTION",
+        "SITE_TAGLINE",
+        "OPERATOR_NAME",
+        "CONTACT_EMAIL",
+        "TWITTER_HANDLE",
+        "pageMetadata",
+    ):
+        assert name in text
+
+
+def test_report_export_entry():
+    text = (SRC / "src/lib/report-export.ts").read_text(encoding="utf-8")
+    assert "export function exportReportToExcel" in text
+    assert "Findings" in text
+
+
+def test_version_constants():
+    text = (SRC / "src/lib/version.ts").read_text(encoding="utf-8")
+    assert "export const APP_VERSION" in text
+    assert "export const APP_VERSION_DATE" in text