SEV-378: add tolerant formatDate/formatDateTime to shared (v0.3.0)

Our Go/Turso layer emits SQLite datetime('now') as "YYYY-MM-DD HH:MM:SS"
(UTC, no zone), which new Date() can't parse → "Invalid Date" in admin.
formatDate/formatDateTime normalize that shape (space→T + Z) and RFC3339,
returning '' for falsy/invalid. Tests cover both formats + empties.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/format.js

@@ -95,3 +95,29 @@ export function vehicleName({ year, make, model, commissioned } = {}, fallback =
   const v = [year, make, model].filter(Boolean).join(' ');
   return v || fallback;
 }
+
+// SEV-378: our Go/Turso layer emits SQLite `datetime('now')` timestamps as
+// "YYYY-MM-DD HH:MM:SS" (UTC, no zone), which `new Date()` can't reliably
+// parse → "Invalid Date" in the admin UI. normalizeTs handles both that shape
+// and RFC3339; returns null for falsy/invalid so callers render ''.
+function normalizeTs(ts) {
+  if (!ts) return null;
+  const s = String(ts).trim();
+  const sqlite = /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/.test(s);
+  const d = new Date(sqlite ? s.replace(' ', 'T') + 'Z' : s);
+  return isNaN(d.getTime()) ? null : d;
+}
+
+/** Localized date (e.g. "Jun 10, 2026"). '' for missing/invalid input. */
+export function formatDate(ts) {
+  const d = normalizeTs(ts);
+  return d ? d.toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' }) : '';
+}
+
+/** Localized date + time (e.g. "Jun 10, 2026, 2:42 PM"). '' for missing/invalid. */
+export function formatDateTime(ts) {
+  const d = normalizeTs(ts);
+  return d
+    ? d.toLocaleString('en-US', { month: 'short', day: 'numeric', year: 'numeric', hour: 'numeric', minute: '2-digit' })
+    : '';
+}