feat(ui): static shell + router + api wrapper

Three-column grid (sidebar / main / right rail) with Cradle aesthetic:
blackflame accent on Cinzel display headings + Cormorant Garamond body
in cards, system UI for chrome. Hash-based router covers all entity
routes plus search, inbox, sacred-valley. api.js stores OWNER_TOKEN in
localStorage and prompts via a modal on 401. dom.js provides safe el()
+ mount() builders so no component ever assigns innerHTML from API data
(the only exception is an explicit, scary-named html: opt-in for
sanitizer output, used later by the markdown editor).

state.js is a tiny event bus for shared chrome state (pending count).
Components and views are loaded as ES modules — sidebar / topbar /
rightrail + 9 view stubs that the later Phase E tasks fill in.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

public/views/page.js

@@ -0,0 +1,9 @@
+// T17 stub — full implementation lands in T20.
+import { el, mount } from '../dom.js';
+export async function render(main, ctx) {
+  mount(main,
+    el('h1', { class: 'view-h1' }, 'Page'),
+    el('p', { class: 'view-sub muted' }, 'id: ' + (ctx.params.id || '—')),
+    el('div', { class: 'card muted' }, 'Page editor ships in T20.')
+  );
+}