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

web/messages/es/docs/post-install/system.json

@@ -85,7 +85,7 @@
     "intro": "Instala <code>kexec-tools</code> y lo conecta para que puedas reiniciar el host directamente a un kernel nuevo <em>sin pasar por el firmware BIOS/UEFI</em>. En servidores grandes donde el POST tarda 45 – 90 segundos, esto convierte un reinicio de una pausa para el café en unos pocos segundos de downtime.",
     "installsTitle": "Qué instala ProxMenux",
     "installsItems": [
-      "Paquete <code>kexec-tools</code> (con debconf pre-respondido para que apt no pregunte durante la instalación).",
+      "Paquete <code>kexec-tools</code> (debconf pre-respondido con <code>kexec-tools/load_kexec boolean false</code> para que apt no pregunte y quede desactivado el auto-load al apagar).",
       "Unit systemd <code>/etc/systemd/system/kexec-pve.service</code> — carga el kernel de Proxmox y el initrd en memoria al arrancar, reutilizando la cmdline actual.",
       "Un alias en <code>/root/.bash_profile</code>: <code>reboot-quick</code> → <code>systemctl kexec</code>."
     ],