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/ui/PromptDialog.svelte

@@ -0,0 +1,29 @@
+<script lang="ts">
+  import Modal from './Modal.svelte';
+
+  let { title, label, confirm, danger = false, input = 'text', initial = '', text = '', onsubmit, onclose }:
+    { title: string; label: string; confirm: string; danger?: boolean; input?: 'text' | 'password' | 'none'; initial?: string;
+      text?: string; onsubmit: (value: string) => void; onclose: () => void } = $props();
+
+  // svelte-ignore state_referenced_locally
+  let value = $state(initial);
+</script>
+
+<Modal {title} {onclose}>
+  <form id="prompt" onsubmit={e => { e.preventDefault(); onsubmit(value); onclose(); }}>
+    {#if text}<p>{text}</p>{/if}
+    {#if input !== 'none'}
+      <label for="p-val">{label}</label>
+      <!-- svelte-ignore a11y_autofocus -->
+      <input id="p-val" type={input} bind:value autofocus autocomplete="off" />
+    {/if}
+  </form>
+  {#snippet footer()}
+    <button class="btn" onclick={onclose}>Cancel</button>
+    <button class="btn" class:primary={!danger} class:danger type="submit" form="prompt">{confirm}</button>
+  {/snippet}
+</Modal>
+
+<style>
+  p { color: var(--text-dim); }
+</style>