Create standalone browser port of LTX Athena with authenticated native API transport

frontend/lib/upgrade-prompt-dismissals.ts

@@ -0,0 +1,29 @@
+// Persisted "don't show the LTX upgrade prompt again" set, keyed by target model id.
+// Best-effort: if localStorage is unavailable the prompt simply reappears next session.
+const KEY = 'ltxDismissedUpgrades'
+
+function read(): string[] {
+  try {
+    const raw = localStorage.getItem(KEY)
+    if (!raw) return []
+    const parsed: unknown = JSON.parse(raw)
+    return Array.isArray(parsed) ? parsed.filter((v): v is string => typeof v === 'string') : []
+  } catch {
+    return []
+  }
+}
+
+export function isUpgradeDismissed(modelId: string): boolean {
+  return read().includes(modelId)
+}
+
+export function dismissUpgrade(modelId: string): void {
+  try {
+    const ids = read()
+    if (!ids.includes(modelId)) {
+      localStorage.setItem(KEY, JSON.stringify([...ids, modelId]))
+    }
+  } catch {
+    // ignore — persistence is best-effort
+  }
+}