spa: avatar + name für kommentar-authoren via kind:0-profil

- loadProfile(pubkey?) akzeptiert jetzt optional einen Pubkey, default
  weiterhin AUTHOR_PUBKEY_HEX.
- Neuer profileCache.ts: sessionsweiter Cache, Promise-Memoization —
  paralleles Nachladen derselben Pubkey teilt dieselbe Request.
- ReplyItem lädt das kind:0-Profil des Kommentar-Authors on mount,
  zeigt Avatar (32px rund) + display_name/name. Fallback bei fehlendem
  Profil: Pubkey-Hex-Prefix (wie bisher).
- Home-Page nutzt getProfile(AUTHOR_PUBKEY_HEX) statt loadProfile()
  direkt — gleicher Cache, kein doppeltes Fetchen.

npm run check: 0 errors. E2E 3/3 grün. Deploy live.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/lib/components/ReplyItem.svelte

@@ -1,5 +1,7 @@
 <script lang="ts">
-	import type { NostrEvent } from '$lib/nostr/loaders';
+	import { onMount } from 'svelte';
+	import type { NostrEvent, Profile } from '$lib/nostr/loaders';
+	import { getProfile } from '$lib/nostr/profileCache';
 
 	interface Props {
 		event: NostrEvent;
@@ -7,15 +9,33 @@
 	let { event }: Props = $props();
 
 	const date = $derived(new Date(event.created_at * 1000).toLocaleString('de-DE'));
-	const authorNpub = $derived(event.pubkey.slice(0, 12) + '…');
+	const npubPrefix = $derived(event.pubkey.slice(0, 12) + '…');
+
+	let profile = $state<Profile | null>(null);
+
+	onMount(async () => {
+		try {
+			profile = await getProfile(event.pubkey);
+		} catch {
+			profile = null;
+		}
+	});
+
+	const displayName = $derived(profile?.display_name || profile?.name || npubPrefix);
 </script>
 
 <li class="reply">
+	<div class="header">
+		{#if profile?.picture}
+			<img class="avatar" src={profile.picture} alt={displayName} />
+		{:else}
+			<div class="avatar avatar-placeholder" aria-hidden="true"></div>
+		{/if}
 		<div class="meta">
-		<span class="author">{authorNpub}</span>
-		<span class="sep">·</span>
+			<span class="name">{displayName}</span>
 			<span class="date">{date}</span>
 		</div>
+	</div>
 	<div class="content">{event.content}</div>
 </li>
 
@@ -25,20 +45,43 @@
 		padding: 0.8rem 0;
 		border-bottom: 1px solid var(--border);
 	}
+	.header {
+		display: flex;
+		gap: 0.6rem;
+		align-items: center;
+		margin-bottom: 0.4rem;
+	}
+	.avatar {
+		flex: 0 0 32px;
+		width: 32px;
+		height: 32px;
+		border-radius: 50%;
+		object-fit: cover;
+		background: var(--code-bg);
+	}
+	.avatar-placeholder {
+		display: block;
+	}
 	.meta {
 		font-size: 0.85rem;
 		color: var(--muted);
-		margin-bottom: 0.3rem;
+		display: flex;
+		flex-direction: column;
+		line-height: 1.3;
 	}
-	.author {
-		font-family: monospace;
-	}
-	.sep {
-		margin: 0 0.4rem;
-		opacity: 0.5;
+	.name {
+		color: var(--fg);
+		font-weight: 500;
+		word-break: break-word;
 	}
 	.content {
 		white-space: pre-wrap;
 		word-wrap: break-word;
+		margin-left: calc(32px + 0.6rem);
+	}
+	@media (max-width: 479px) {
+		.content {
+			margin-left: 0;
+		}
 	}
 </style>

app/src/lib/nostr/loaders.ts

@@ -103,12 +103,16 @@ export async function loadPost(dtag: string): Promise<NostrEvent | null> {
   );
 }
 
-/** Profil-Event kind:0 (neueste Version) */
-export async function loadProfile(): Promise<Profile | null> {
+/**
+ * Profil-Event kind:0 (neueste Version).
+ * Default: Autoren-Pubkey der SPA. Optional: beliebiger Pubkey für
+ * die Anzeige fremder Kommentar-Autoren.
+ */
+export async function loadProfile(pubkey: string = AUTHOR_PUBKEY_HEX): Promise<Profile | null> {
   const relays = get(readRelays);
   const events = await collectEvents(relays, {
     kinds: [0],
-    authors: [AUTHOR_PUBKEY_HEX],
+    authors: [pubkey],
     limit: 1
   });
   if (events.length === 0) return null;

app/src/lib/nostr/profileCache.ts

@@ -0,0 +1,17 @@
+import type { Profile } from './loaders';
+import { loadProfile } from './loaders';
+
+/**
+ * Sessionsweiter Cache für kind:0-Profile.
+ * Jeder Pubkey wird maximal einmal angefragt; mehrfache parallele
+ * Aufrufe teilen sich dieselbe Promise.
+ */
+const cache = new Map<string, Promise<Profile | null>>();
+
+export function getProfile(pubkey: string): Promise<Profile | null> {
+	const existing = cache.get(pubkey);
+	if (existing) return existing;
+	const pending = loadProfile(pubkey);
+	cache.set(pubkey, pending);
+	return pending;
+}

app/src/routes/+page.svelte

@@ -1,7 +1,9 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
 	import type { NostrEvent, Profile } from '$lib/nostr/loaders';
-	import { loadPostList, loadProfile } from '$lib/nostr/loaders';
+	import { loadPostList } from '$lib/nostr/loaders';
+	import { getProfile } from '$lib/nostr/profileCache';
+	import { AUTHOR_PUBKEY_HEX } from '$lib/nostr/config';
 	import ProfileCard from '$lib/components/ProfileCard.svelte';
 	import PostCard from '$lib/components/PostCard.svelte';
 	import LoadingOrError from '$lib/components/LoadingOrError.svelte';
@@ -13,7 +15,7 @@
 
 	onMount(async () => {
 		try {
-			const [p, list] = await Promise.all([loadProfile(), loadPostList()]);
+			const [p, list] = await Promise.all([getProfile(AUTHOR_PUBKEY_HEX), loadPostList()]);
 			profile = p;
 			posts = list;
 			loading = false;