Enable full mode with multiple rooms

src/lib/groups.svelte.ts

@@ -0,0 +1,48 @@
+import { SimplePool } from "@nostr/tools";
+import { RELAY_URL } from "$lib/config";
+
+export type GroupSummary = {
+  id: string; // NIP-29 group id (the `d` tag) — also the room URL slug
+  name: string;
+  picture?: string;
+  about?: string;
+  createdAt: number;
+};
+
+let list = $state<GroupSummary[]>([]);
+let loaded = $state(false);
+
+export const groupsStore = {
+  get list() {
+    return list;
+  },
+  get loaded() {
+    return loaded;
+  },
+};
+
+// Fetch every group the relay hosts. NIP-29 publishes one kind 39000 metadata
+// event per group, so an unfiltered query enumerates them all.
+export async function loadGroups() {
+  const pool = new SimplePool();
+  try {
+    const events = await pool.querySync([RELAY_URL], { kinds: [39000] });
+    list = events
+      .map((e) => {
+        const id = e.tags.find((t) => t[0] === "d")?.[1] ?? "";
+        return {
+          id,
+          name: e.tags.find((t) => t[0] === "name")?.[1] ?? id,
+          picture: e.tags.find((t) => t[0] === "picture")?.[1],
+          about: e.tags.find((t) => t[0] === "about")?.[1],
+          createdAt: e.created_at,
+        };
+      })
+      .filter((g) => g.id)
+      // Alphabetical for now; a per-group position tag will drive order later.
+      .sort((a, b) => a.name.localeCompare(b.name));
+  } finally {
+    loaded = true;
+    pool.close([RELAY_URL]);
+  }
+}