[Themes] Encode home backgrounds as JPEG to slim the repo (#7346)

The home background PNGs shipped since #7280 total ~67 MB and bloat
every clone and pull for other devs. Encode them as JPEG at quality 95
(matching resolution, visually lossless at 40-48 dB PSNR since the art
is noise-heavy renders PNG cannot compress) for ~79% size reduction.

The scheme-variant and theme asset resolution already probe .jpg, so
only the qrc entries needed updating.

Refs #7327

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
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BruebachL 2026-09-24 18:40:04 +02:00 • committed by GitHub
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commit 712ca61a9e
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