1020252969/dsh-wallpaper

One image behind the whole DSH shell. The image layer sits at z-index -1 and the shell's two --dsw-* tokens are repointed at translucent tints, so the picture shows through the frame, sidebar and composer. Ships a bundled default picture so it works with zero configuration, plus a floating panel with five sliders, presets, upload, and an SSRF-guarded URL import; changes persist to a local settings.json and the client self-heals when the SPA replaces its stylesheet.