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/app/[locale]/docs/monitor/dashboard/vms-lxcs/updates/page.tsx

@@ -122,6 +122,9 @@ export default async function UpdatesTabPage({
           </tbody>
         </table>
       </div>
+      <Callout variant="tip">
+        {t.rich("mechanisms.officialReference", { helper: linkHelper })}
+      </Callout>
       <Callout variant="warning">{t.rich("mechanisms.callout", { strong, em, code })}</Callout>
 
       <h2 className="mt-10 mb-4 text-2xl font-semibold text-gray-900">{t("docker.heading")}</h2>