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.

scripts/i18n.mjs

@@ -8,7 +8,8 @@
 // lists it.
 //
 // Messages are the English literals passed to t(), tn() and msg() in src/,
-// plus the markup opted in with data-i18n* in src/ui/templates and index.html.
+// plus the markup opted in with data-i18n* in index.html, src/ui/templates and
+// the Vue views.
 // It also lists UI text that is not marked at all (see findUnmarked).
 import { existsSync, readFileSync, writeFileSync } from 'node:fs';
 import { execFileSync } from 'node:child_process';