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/ui/styles/kit.css

@@ -98,3 +98,9 @@
   font: 600 9px/14px var(--font-mono);
   text-align: center;
 }
+
+/* Application view hosts (src/ui/views): the view's own elements lay out as
+   children of the page, as the static markup they replace did. */
+.gev-view {
+  display: contents;
+}