fix(security): a dismissed status announcement no longer hides the security nudge (#307)

SecurityBanner asked pickBanner whether another strip would show without
the dismissed set, so a dismissed Kuma announcement (often pinned for
weeks) still counted and suppressed the verify / backup nudge on every
device that had dismissed it. The dismissed set is now a shared jotai
atom (still persisted to localStorage) used by both banners. Adds a
Playwright regression.

Fixes #307

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/state/serverStatus.ts

@@ -16,3 +16,35 @@ export const serverStatusAtom = atom<{
   syncLost: false,
   lostAt: null,
 });
+
+const DISMISS_KEY = 'lotus-status-banner-dismissed';
+const DISMISS_MAX = 50;
+
+const readDismissed = (): string[] => {
+  try {
+    const v = JSON.parse(localStorage.getItem(DISMISS_KEY) ?? '[]');
+    return Array.isArray(v) ? v.filter((k): k is string => typeof k === 'string') : [];
+  } catch {
+    return [];
+  }
+};
+
+const baseDismissedAtom = atom<string[]>(readDismissed());
+
+/**
+ * [Gitea #307] Status strips the user dismissed (by banner key), shared so
+ * the security nudge knows a dismissed announcement isn't on screen.
+ * Persisted to localStorage; session-only if storage is unavailable.
+ */
+export const statusDismissedAtom = atom(
+  (get) => get(baseDismissedAtom),
+  (get, set, key: string) => {
+    const next = [...get(baseDismissedAtom).filter((k) => k !== key), key].slice(-DISMISS_MAX);
+    try {
+      localStorage.setItem(DISMISS_KEY, JSON.stringify(next));
+    } catch {
+      // storage unavailable — dismissed for this session only
+    }
+    set(baseDismissedAtom, next);
+  },
+);