refine post-install and hardware GPU docs, Monitor UX and CLI styling

- rewrite the 15 post-install pages and the 3 hardware GPU pages so they reflect the current scripts (reversibility, tracked-tool counts, kernel parameters, per-tool commands, Alpine LXC propagation flow)
- migrate the legacy step-badge helper on post-install/optional and create-vm/synology to the canonical pill component, with the stepLabel key added in each locale
- fix rich-text i18n calls missing helpers across network, automated, optional, security, customization and the post-install landing pages, and escape the `<iface>` placeholder in automated so intl no longer parses it as a tag
- remove the mouse-follow blue overlay from the docs landing layout
- reposition the App-tab Edit button and stack the Search and Register controls vertically on mobile
- move the Bulk update Configure/Edit control into the section header so it behaves the same on desktop and mobile
- show a spinner during the final autoremove/autoclean pass of update-pve-safe so the cleanup step reads as active instead of silent
- restyle the shell spinner and msg_info in a distinctive purple and drop the unused msg_lang duplicate
- add a web-docs i18n build script and its CI workflow, plus tests for the pushover notification channel

AppImage/messages/de/common.json

@@ -1839,6 +1839,14 @@
         "toAddresses": "An Adressen (durch Kommas getrennt)",
         "subjectPrefix": "Betreff-Präfix",
         "emailHint": "Lassen Sie den SMTP-Host leer, um lokales Sendmail zu verwenden. Verwenden Sie für Gmail ein App-Passwort.",
+        "enablePushover": "Pushover aktivieren",
+        "pushoverUserKey": "Benutzer- oder Gruppenschlüssel",
+        "pushoverApiToken": "API-Token der Anwendung",
+        "pushoverDevice": "Gerät",
+        "pushoverSound": "Ton",
+        "pushoverCriticalPriority": "Hohe Priorität für kritische Warnungen",
+        "pushoverCriticalPriorityDescription": "KRITISCHE Benachrichtigungen verwenden die hohe Pushover-Priorität. Die Notfallpriorität wird nicht verwendet.",
+        "pushoverCredentialsHint": "Erstellen Sie eine Anwendung in Pushover und kopieren Sie deren API-Token sowie Ihren Benutzer- oder Gruppenschlüssel.",
         "enableApprise": "Aktivieren Sie Apprise",
         "urlFormats": "+URL-Formate",
         "appriseUrl": "Apprise-URL",