Refactor analytics to /_a instead of under article pages.

frontend/src/analytics-main.js

@@ -0,0 +1,24 @@
+// Analytics page entry: mounts AnalyticsView inside the normal page layout.
+// The backend renders #analytics-app inside #main and links this module for
+// the initial load; pagerite.js also imports it on fetch-navigation to /_a.
+import { createApp } from 'vue'
+import AnalyticsView from './AnalyticsView.vue'
+
+let app = null
+
+export function mount(container) {
+  if (app) return
+  app = createApp(AnalyticsView, {
+    initialRange: new URLSearchParams(location.search).get('range') || 'week',
+  })
+  app.mount(container)
+}
+
+export function unmount() {
+  app?.unmount()
+  app = null
+}
+
+// Auto-mount on a normal (non-fetch) page load.
+const container = document.getElementById('analytics-app')
+if (container) mount(container)