Add TMDB metadata client and Fetch Data: real episode titles/air dates via TMDB, with a Settings modal for the API token

src/components/Icons.tsx

@@ -144,3 +144,12 @@ export function FetchIcon() {
     </svg>
   );
 }
+
+export function KeyIcon() {
+  return (
+    <svg {...{ ...base, width: 15, height: 15 }}>
+      <circle cx="8" cy="15" r="4" />
+      <path d="M11 12l9-9M16 5l3 3M13 8l3 3" />
+    </svg>
+  );
+}