feat(ui): render application templates as Vue views mounted before wiring

Templates listed in build/applicationViews.js expand to mount hosts, and
mountApplicationViews() renders them before translation and wiring. Markup
tests read the page through a server-side render helper, the i18n scanner
reads view templates, and Vue preserves whitespace so views keep the exact
DOM. No template is converted yet.

src/reasonableDefaults.test.mjs

@@ -1,5 +1,5 @@
 import { readShellSource } from './testSupport/readShellSource.mjs';
-import { expandApplicationHtml } from '../build/application-html.js';
+import { renderApplicationHtml } from './testSupport/applicationHtml.mjs';
 // src/reasonableDefaults.test.mjs
 //
 // What the console looks like the FIRST time it opens — before any share link,
@@ -46,7 +46,7 @@ import { ShareLinkManager } from './sharelink.js';
 // Follow the UI wiring and its extracted preset definitions.
 const uiSource = readShellSource()
   + '\n' + fs.readFileSync(new URL('./ui/visualPresets.js', import.meta.url), 'utf8');
-const indexHtml = expandApplicationHtml(fs.readFileSync(new URL('../index.html', import.meta.url), 'utf8'));
+const indexHtml = await renderApplicationHtml(fs.readFileSync(new URL('../index.html', import.meta.url), 'utf8'));
 const shareSource = fs.readFileSync(new URL('./sharelink.js', import.meta.url), 'utf8');
 
 /** Slice ui.js between two literal anchors, so a pin reads one method, not the file. */