wallpaper: upscale a too-small staged image in place

A staged wallpaper smaller than its screen (yellow or red border) gets an
"Upscale 4x" button. It rewrites the file with Real-ESRGAN through
stable-diffusion.cpp's `sd-cli -M upscale`, keeping the name, so wallp's
state and the engine's lists, which name it by path, still find it.
sd-cli writes to a dot-named sibling the scan skips, and only a
successful run is moved over the original.

Success needs no [E] line as well as exit 0: with a model that fails to
load, sd-cli logs "[E] new_upscaler_ctx failed", saves the input
unscaled and exits 0 (measured).

The button takes two clicks so the model choice shows before anything is
rewritten. The first runs Imajev-4B, a small Jev-style vision decision
model, through llama-mtmd-cli on a 512 px thumbnail, with a grammar that
allows only A (anime) or B (photo or render); greedy decoding then
returns the higher-logit option, about 1.7 s. The label becomes
"Upscale 4x (anime)" or "(photo)", and the second click upscales with
the anime or the general model. Anything but A, including a failed
decider, picks the general model, safe on any image.

Imajev-4B was chosen by measurement on 22 wallpapers: all 12 anime and 4
photos right, 4 of 6 painted 3D renders called anime (those come out
smoother than painted). The 2B got 17 of 22, leaning to photo; a
three-way prompt adding "painted or render" dropped both to 15 or
fewer, with most anime called painted.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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