Initial commit: mumh5, a modern Mumble client

Electron desktop app with a Svelte 5 interface for any Mumble server.

- Mumble protocol core: TLS, handshake, channels, users, text, plugin data,
  client-side pacing of Murmur's rate limits
- Voice: WebCodecs Opus over the TCP tunnel, voice activity, push to talk,
  always-on, devices, per-user volume and local mute
- Several servers at once, voice on one; server rail with icons and ordering
- Chat: channels, direct messages, side chat, file sharing through f0ckm,
  inline images without it, click-to-play YouTube
- Profiles with rich descriptions, registration, rename, nicknames,
  connection information and moderation menus
- Identity wizard, multiple identities, PKCS#12 import/export, desktop
  Mumble certificate import, certificate pinning and viewer
- Tray icon with voice state
- Unit, server and end-to-end tests against a real Murmur

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

src/lib/ui.svelte.ts

@@ -0,0 +1,35 @@
+import type { CertDetails } from '../core/transport.ts';
+
+export interface PromptRequest {
+  title: string;
+  label: string;
+  confirm: string;
+  danger?: boolean;
+  input?: 'text' | 'password' | 'none';
+  initial?: string;
+  text?: string;
+  onsubmit: (value: string) => void;
+}
+
+export interface CertRequest {
+  title: string;
+  chain: CertDetails[];
+  status?: { ok: boolean; text: string };
+}
+
+// App-wide dialogs that can be opened from anywhere (menus, panels)
+class Ui {
+  prompt = $state<PromptRequest | null>(null);
+  cert = $state<CertRequest | null>(null);
+  settingsOpen = $state(false);
+  wizard = $state<'setup' | 'add' | null>(null);
+  // Quick audio popover from right-clicking mute (input) or deafen (output)
+  quickAudio = $state<{ kind: 'input' | 'output'; x: number; y: number } | null>(null);
+  settingsTab = $state<'voice' | 'files' | 'identities'>('voice');
+  // Session whose connection information is shown
+  userInfo = $state<number | null>(null);
+  // Set when a panel was opened on a layout where it is an overlay
+  panelOpen = $state(false);
+}
+
+export const ui = new Ui();