Instead of a fixed banner that covers the top of the page, the update
notification now replaces only the header title area (the centered title):
- .header-title content is swapped in-place with an animated pill:
⬆️ v1.x.x [Aggiorna] ✕
- Pulsing animation (header-update-pulse) draws attention without being
intrusive; camera and Gemini buttons stay exactly where they are
- [Aggiorna] button does window.location.reload()
- [✕] dismisses: for a release update stores publishedAt so it won't reappear;
for a server deploy simply restores title (reappears next 5-min check)
- Auto-restores after 60 s without marking as seen
- Removed the old fixed position:fixed banner entirely
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