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/en/docs/post-install/system.json

@@ -85,7 +85,7 @@
     "intro": "Installs <code>kexec-tools</code> and wires it up so you can reboot the host straight into a new kernel <em>without going through BIOS/UEFI firmware</em>. On big servers where POST takes 45 – 90 seconds, this turns a reboot from a coffee break into a few seconds of downtime.",
     "installsTitle": "What ProxMenux installs",
     "installsItems": [
-      "Package <code>kexec-tools</code> (with debconf pre-answered so apt doesn't prompt during install).",
+      "Package <code>kexec-tools</code> (debconf pre-answered with <code>kexec-tools/load_kexec boolean false</code> so apt doesn't prompt and the auto-load on shutdown stays off).",
       "Systemd unit <code>/etc/systemd/system/kexec-pve.service</code> — loads the Proxmox kernel and initrd into memory at boot, reusing the current cmdline.",
       "An alias in <code>/root/.bash_profile</code>: <code>reboot-quick</code> → <code>systemctl kexec</code>."
     ],