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/fr/common.json

@@ -1839,9 +1839,17 @@
         "toAddresses": "Aux adresses (séparées par des virgules)",
         "subjectPrefix": "Préfixe du sujet",
         "emailHint": "Laissez l'hôte SMTP vide pour utiliser sendmail local. Pour Gmail, utilisez un mot de passe d'application.",
+        "enablePushover": "Activer Pushover",
+        "pushoverUserKey": "Clé utilisateur ou groupe",
+        "pushoverApiToken": "Jeton API de l’application",
+        "pushoverDevice": "Appareil",
+        "pushoverSound": "Son",
+        "pushoverCriticalPriority": "Priorité élevée pour les alertes critiques",
+        "pushoverCriticalPriorityDescription": "Les notifications CRITIQUES utilisent la priorité élevée de Pushover. La priorité d’urgence n’est pas utilisée.",
+        "pushoverCredentialsHint": "Créez une application dans Pushover, puis copiez son jeton API et votre clé utilisateur ou groupe.",
         "enableApprise": "Activer Apprise",
         "urlFormats": "+Formats d'URL",
-        "appriseUrl": "URL d'information",
+        "appriseUrl": "URL Apprise",
         "showUrl": "Afficher l'URL",
         "hideUrl": "Masquer l'URL",
         "appriseDescription": "Une URL permet à Apprise d'acheminer la notification vers le bon service. Exemples :",