chore(lfs): track wallpaper collection as LFS; wallpapers move into repo tree under noctalia data path

.gitattributes

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+*.jpg filter=lfs diff=lfs merge=lfs -text
+*.jpeg filter=lfs diff=lfs merge=lfs -text
+*.png filter=lfs diff=lfs merge=lfs -text
+*.webp filter=lfs diff=lfs merge=lfs -text

.githooks/pre-push

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+#!/bin/sh
+# git-lfs pre-push — required because core.hooksPath=.githooks disables the
+# default .git/hooks/pre-push; without this hook, pushes would upload LFS
+# pointer files without their objects and break every fresh clone.
+command -v git-lfs >/dev/null 2>&1 || { printf >&2 'n' ; exit 0; }
+git lfs pre-push "$@"