Add the browser version, a toolbar, description previews and hints

Browser version
- Self-hosted proxy (server/) that serves the web build and bridges WebSocket
  connections to Mumble servers over TLS, with a server allowlist or allow-any mode
- WebSocket transport and a browser platform layer; identities live in the browser
- npm run build:web, dev:web, proxy and test:e2e:web; proxy unit tests

Interface
- Toolbar next to mute and deafen: description editor, settings, expand or collapse all
- Channels with a description show a marker; resting on the row previews it
- Collapse all keeps channels with people open
- Hints (title tooltips) can be switched on in a new Accessibility settings tab
- New identities can set the username suggested when connecting
- Own user information tells the client address from the one the server sees

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/RightPanel.svelte

@@ -8,6 +8,7 @@
   import { session } from '../lib/session.svelte.ts';
   import { store } from '../lib/settings.svelte.ts';
   import { menu } from '../lib/menu.svelte.ts';
+  import { ui } from '../lib/ui.svelte.ts';
   import { userMenu, changeNamePrompt } from '../lib/actions.ts';
   import { voice } from '../lib/audio/voice.svelte.ts';
   import { renderIncoming } from '../lib/html.ts';
@@ -45,6 +46,13 @@
     editing = true;
   }
 
+  // After the reset above, so a request from the toolbar survives the panel switching to the profile
+  $effect(() => {
+    if (!ui.editDescription || !isSelf) return;
+    ui.editDescription = false;
+    startEdit();
+  });
+
   function saveComment() {
     session.setComment(draft);
     editing = false;