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

lang/es.json

@@ -441,8 +441,8 @@
   "CPU set to host,hidden=1,flags=+pcid": "CPU configurada como host,hidden=1,flags=+pcid",
   "CPU vendor (intel/amd):": "Proveedor de CPU (Intel/AMD):",
   "CRITICAL: The selected disk is referenced by a RUNNING VM or CT.": "CRÍTICO: El disco seleccionado tiene referencia a una VM o CT EN EJECUCIÓN.",
-  "CT": "Connecticut",
-  "CT started successfully.": "La TC se inició con éxito.",
+  "CT": "LXC",
+  "CT started successfully.": "El LXC se inició con éxito.",
   "Cancel": "Cancelar",
   "Cancel restore": "Cancelar restauración",
   "Cancel this setup": "cancelar esta configuración",