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/components/sidebar.js

@@ -0,0 +1,12 @@
+// T17 stub — full implementation lands in T18.
+// For now: brand only, so the shell renders without errors.
+import { el, mount } from '../dom.js';
+
+export function renderSidebar(root) {
+  mount(root,
+    el('div', { class: 'sb-section' },
+      el('div', { class: 'sb-title' }, 'Void'),
+      el('div', { class: 'sb-item muted' }, 'Sidebar loads in T18')
+    )
+  );
+}