feat(ui): render every application template except the loading screen as a Vue view

The scene chrome, cockpit, Display controls, command dock, layer panels,
Context rail, welcome card and Provider Settings move verbatim into
src/ui/views and mount into their hosts before the page is translated and
wired. Each view renders the same elements, attributes and text as its
template; Vue keeps whitespace between elements as one space, and no view
markup sits under a white-space: pre rule.

Template asset URLs stay literal, view files are left out of Prettier so
the markup is not reflowed, and the Node component loader moves to build/
and is exported as build/register-vue for host test runners. Hosts that do
not initialize Core's locale pass localePicker: false instead of editing
the markup.

src/ui/railScrollers.test.mjs

@@ -11,8 +11,8 @@ const read = (path) => readFileSync(new URL(path, import.meta.url), 'utf8');
 test('every scroller the rail measuring pass lifts restores its scroll offset', () => {
   const css = read('./styles/layers.css');
   const templates = [
-    read('./templates/context.html'),
-    read('./templates/layer-panels.html'),
+    read('./views/ContextView.vue'),
+    read('./views/LayerPanelsView.vue'),
   ].join('\n');
   const lifted = [
     ...css.matchAll(