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/it/common.json

@@ -1839,9 +1839,17 @@
         "toAddresses": "Agli indirizzi (separati da virgole)",
         "subjectPrefix": "Prefisso oggetto",
         "emailHint": "Lascia vuoto l'host SMTP per utilizzare sendmail locale. Per Gmail, utilizza una password per l'app.",
-        "enableApprise": "Abilita Appres",
+        "enablePushover": "Abilita Pushover",
+        "pushoverUserKey": "Chiave utente o gruppo",
+        "pushoverApiToken": "Token API dell’applicazione",
+        "pushoverDevice": "Dispositivo",
+        "pushoverSound": "Suono",
+        "pushoverCriticalPriority": "Priorità alta per gli avvisi critici",
+        "pushoverCriticalPriorityDescription": "Le notifiche CRITICHE usano la priorità alta di Pushover. La priorità di emergenza non viene utilizzata.",
+        "pushoverCredentialsHint": "Crea un’applicazione in Pushover e copia il relativo token API e la chiave utente o gruppo.",
+        "enableApprise": "Abilita Apprise",
         "urlFormats": "+Formati URL",
-        "appriseUrl": "Informare l'URL",
+        "appriseUrl": "URL di Apprise",
         "showUrl": "Mostra URL",
         "hideUrl": "Nascondi l'URL",
         "appriseDescription": "Un URL consente ad Apprise di indirizzare la notifica al servizio giusto. Esempi:",