feat: 1-to-1 message render + web data-lake backend

frontend/src/lib/format/peer.ts

@@ -0,0 +1,48 @@
+import type { Account, PeerView } from "$lib/api/types";
+
+const PEER_COLOR_COUNT = 7;
+
+export function peerColorIndex(id: number): number {
+  return Math.abs(id) % PEER_COLOR_COUNT;
+}
+
+export function peerName(peer: PeerView | null): string {
+  if (!peer) {
+    return "";
+  }
+  if (peer.is_deleted_account) {
+    return "Deleted Account";
+  }
+  const parts = [peer.first_name, peer.last_name].filter(Boolean);
+  if (parts.length > 0) {
+    return parts.join(" ");
+  }
+  if (peer.username) {
+    return `@${peer.username}`;
+  }
+  return String(peer.peer_id);
+}
+
+export function accountName(account: Account): string {
+  return (
+    account.label ??
+    account.phone ??
+    String(account.tg_user_id ?? account.account_id)
+  );
+}
+
+const WHITESPACE = /\s+/;
+
+export function initials(name: string): string {
+  const words = name.trim().split(WHITESPACE).filter(Boolean);
+  if (words.length === 0) {
+    return "?";
+  }
+  const first = words[0][0];
+  if (words.length === 1) {
+    return first.toUpperCase();
+  }
+  const lastWord = words.at(-1);
+  const last = lastWord ? lastWord[0] : "";
+  return (first + last).toUpperCase();
+}