refactor(build): place the views in the page instead of expanding templates

index.html now lists each view's host and the loading screen itself, so
the gev:template expansion plugin, its view list, the loading-screen
template and the ./build/html export are gone. createApplication takes
omitViews for views an application leaves out; their hosts are removed,
and a view an earlier call rendered is unmounted.

build/application-html.js

@@ -1,52 +0,0 @@
-import { readFileSync } from 'node:fs';
-import { APPLICATION_VIEW_NAMES } from './applicationViews.js';
-
-export const APPLICATION_TEMPLATES = Object.freeze([
-  'scene-chrome',
-  'cockpit',
-  'display-controls',
-  'command-dock',
-  'layer-panels',
-  'context',
-  'welcome',
-  'provider-settings',
-  'hud-loading',
-]);
-const allowed = new Set(APPLICATION_TEMPLATES);
-const views = new Set(APPLICATION_VIEW_NAMES);
-
-/**
- * The element a Vue view renders into. `display: contents` keeps the view's
- * own elements laid out as children of the page.
- * @param {string} name Application template name.
- */
-export function applicationViewHost(name) {
-  return `<div class="gev-view" data-gev-view="${name}"></div>\n`;
-}
-
-/** Expand only known component templates; markers cannot name filesystem paths. */
-export function expandApplicationHtml(html) {
-  return html.replace(
-    /^[ \t]*<!-- gev:template ([^\s]+) -->\r?\n?/gm,
-    (_, name) => {
-      if (!allowed.has(name))
-        throw new Error(`Unknown application template: ${name}`);
-      if (views.has(name)) return applicationViewHost(name);
-      return readFileSync(
-        new URL(`../src/ui/templates/${name}.html`, import.meta.url),
-        'utf8',
-      );
-    },
-  );
-}
-
-/** Assemble static application markup before Vite processes scripts and assets. */
-export function applicationHtmlPlugin() {
-  return {
-    name: 'application-component-templates',
-    transformIndexHtml: {
-      order: 'pre',
-      handler: expandApplicationHtml,
-    },
-  };
-}

build/applicationViews.js

@@ -1,16 +0,0 @@
-/**
- * Application templates that are now Vue views (src/ui/views). Their markers
- * expand to a mount host instead of static markup, and
- * `mountApplicationViews()` renders them before the page is wired. The
- * loading screen stays static so it paints before any script runs.
- */
-export const APPLICATION_VIEW_NAMES = Object.freeze([
-  'provider-settings',
-  'scene-chrome',
-  'cockpit',
-  'display-controls',
-  'command-dock',
-  'layer-panels',
-  'context',
-  'welcome',
-]);

build/vite.js

@@ -1,5 +1,4 @@
 import { fileURLToPath } from 'node:url';
-import { applicationHtmlPlugin } from './application-html.js';
 import cesium from 'vite-plugin-cesium';
 import vue from '@vitejs/plugin-vue';
 import { VUE_PLUGIN_OPTIONS } from './vueOptions.js';
@@ -157,7 +156,6 @@ export function createBrowserViteConfig({
       // Next, so no provider route answers a Host the server does not allow.
       hostCheckPlugin(),
       cesium(),
-      applicationHtmlPlugin(),
       // Application views are Vue single-file components.
       vue(VUE_PLUGIN_OPTIONS),
       ...plugins,