- Web: favicon.ico + png icons under static/, served from the site root
and linked from every page head.
- Android: the artwork becomes the launcher icon — the 432px adaptive
foreground over the gruvbox background, replacing the placeholder vector
drawables.
- Desktop: the icon is the Qt window/taskbar icon (embedded via app.qrc),
and the app is now an installable package — a wrapped binary, a
photog.desktop entry, and hicolor icons — so `nix profile install
./desktop` puts "Photog" in the application menu.
Each timeline date heading now links to /day/<YYYY-MM-DD>/, a page
holding just that day's photos with a back link to the timeline.
renderDayPages writes one per groupByDay run; the ISO label doubles
as the URL slug.
puttaalu