feat(web): favicon + toast feedback (polish)

Add a vinyl-record favicon (icon.svg) — fixes the favicon.ico 404 console
error. Lightweight toast system (ToastHost + toast()) fired on request, wanted
add, search, follow, and want actions so submits give explicit feedback.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/queue.tsx

@@ -6,6 +6,7 @@ import { StatTiles } from "./_ui/stat-tiles";
 import { SectionHeader } from "./_ui/section-header";
 import { JobRow } from "./_ui/job-row";
 import { PressedList } from "./_ui/pressed-list";
+import { toast } from "./_ui/toast";
 
 type Row = {
   id: string;
@@ -53,11 +54,13 @@ export function Queue() {
   async function submit(e: React.FormEvent) {
     e.preventDefault();
     if (!artist.trim() || !album.trim()) return;
+    const label = album.trim();
     await fetch("/api/requests", {
       method: "POST",
       headers: { "content-type": "application/json" },
       body: JSON.stringify({ artist, album }),
     });
+    toast(`Queued ${label}`);
     setArtist("");
     setAlbum("");
     refresh();