feat: DevDesk v0.1.0, a persistent browser terminal for Claude Code

ttyd serves a single-file xterm.js UI styled with the LotusGuild TDS
(web_template base.css). Sessions live in a dedicated tmux server unit
(devdesk-tmux.service), so restarting or upgrading the web unit never
stops Claude. Each named session maps to a project directory. A Claude
SessionStart hook records the conversation ID, so after a reboot the
session resumes that exact conversation.

- bin/devdesk: attach / new / ls / end / pick, with an fzf picker
- ttyd requires a credential that NPM injects; origin check enabled
- debian/: dh 13 with --no-stop-on-upgrade for the tmux unit, bundled
  sha256-verified ttyd 1.7.7, lintian overrides, man page
- CI: lint, test, build, smoke-test, artifact; v* tags publish to the
  Gitea apt registry and create a release

Refs: tinker ticket 887531976

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

web/src/notify.js

@@ -0,0 +1,60 @@
+// Bell → attention: desktop notification, favicon badge and a title prefix while
+// the tab is in the background. Claude rings the bell (preferredNotifChannel:
+// terminal_bell) when it finishes a turn or needs input.
+
+import { FAVICON, FAVICON_BADGE } from './icon.js';
+
+let unread = 0;
+let baseTitle = document.title;
+
+function attentive() {
+  return !document.hidden && document.hasFocus();
+}
+
+function render() {
+  document.title = unread ? `(${unread}) ${baseTitle}` : baseTitle;
+  const link = document.getElementById('favicon');
+  if (link) link.href = unread ? FAVICON_BADGE : FAVICON;
+}
+
+export function setBaseTitle(title) {
+  baseTitle = title;
+  render();
+}
+
+export function notificationsState() {
+  if (!('Notification' in window)) return 'unsupported';
+  return Notification.permission; // granted | denied | default
+}
+
+export async function requestNotifications() {
+  if (notificationsState() !== 'default') return notificationsState();
+  return Notification.requestPermission();
+}
+
+export function ring(session, detail) {
+  if (attentive()) return;
+  unread += 1;
+  render();
+  if (notificationsState() === 'granted') {
+    const note = new Notification(`Claude · ${session || 'devdesk'}`, {
+      body: detail || 'Claude needs your attention',
+      tag: `devdesk-${session}`,
+      renotify: true,
+      icon: FAVICON,
+    });
+    note.onclick = () => {
+      window.focus();
+      note.close();
+    };
+  }
+}
+
+function clear() {
+  if (!unread || !attentive()) return;
+  unread = 0;
+  render();
+}
+
+window.addEventListener('focus', clear);
+document.addEventListener('visibilitychange', clear);