feat(ui): Terminal tab — embedded blackflame ttyd to CT300 (claude in persistent tmux)

ttyd on CT300 (:7681, firewalled to Traefik) behind same-origin /terminal via
Traefik + CF Access; iframe view + nav entry.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/views/terminal.js

@@ -0,0 +1,21 @@
+// #/terminal — embeds the CT 300 web terminal (ttyd → persistent tmux/claude),
+// same-origin under /terminal so it shares the Void's CF Access session.
+import { el, mount } from '../dom.js';
+
+export async function render(main) {
+  mount(main,
+    el('div', { class: 'term-bar' },
+      el('span', { class: 'term-title' }, '◆ Terminal'),
+      el('span', { class: 'muted', style: { fontSize: '11px' } }, 'claude @ ct300 · persistent tmux'),
+      el('button', { class: 'ghost', style: { marginLeft: 'auto' }, onclick: () => {
+        const f = document.getElementById('term-frame'); if (f) f.src = f.src;
+      } }, '⟳ Reconnect')
+    ),
+    el('iframe', {
+      id: 'term-frame',
+      src: '/terminal/',
+      class: 'term-frame',
+      allow: 'clipboard-read; clipboard-write'
+    })
+  );
+}