migrate auth v2 code

frontend/src/lib/stores/chat.svelte.ts

@@ -7,8 +7,18 @@ interface ChatInit {
 	actorType: 'admin' | 'member';
 	actorName: string;
 	actorColor: string;
-	deviceToken?: string;
-	memberId?: string;
+	pbToken?: string;
+	
+}
+
+// Client id for optimistic chat messages. `crypto.randomUUID()` requires a
+// secure context (HTTPS/localhost) — over plain HTTP on a LAN it's undefined,
+// so fall back to a time+random string that's still unique enough per session.
+function genClientId(): string {
+	if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+		return crypto.randomUUID();
+	}
+	return Date.now().toString(36) + Math.random().toString(36).slice(2);
 }
 
 class ChatStore {
@@ -23,8 +33,7 @@ class ChatStore {
 	actorType = $state<'admin' | 'member'>('member');
 	actorName = $state('');
 	actorColor = $state('');
-	deviceToken = $state('');
-	memberId = $state('');
+	pbToken = $state('');
 
 	private unsubs: (() => void)[] = [];
 	private destroyed = false;
@@ -46,8 +55,7 @@ class ChatStore {
 		this.actorType = opts.actorType;
 		this.actorName = opts.actorName;
 		this.actorColor = opts.actorColor;
-		this.deviceToken = opts.deviceToken || '';
-		this.memberId = opts.memberId || '';
+		this.pbToken = opts.pbToken || '';
 
 		if (this.initialized && this.famId === opts.famId) return;
 		if (this.initPromise) {
@@ -185,7 +193,7 @@ class ChatStore {
 	async send(content: string) {
 		const text = content.trim();
 		if (!text || !this.famId) return;
-		const clientId = crypto.randomUUID();
+		const clientId = genClientId();
 		const temp: ChatMessage = {
 			id: 'temp-' + clientId,
 			famId: this.famId,