feat(theme): themes as files (theme crate: toml subset + ints, contrast check, wire); whimsy dark + light; display reads themes/, serves THEME/THEME_NAME, init SET_THEME -> THEME_CHANGED to all windows, bar themed; k-ui follows; settings appearance; init keeps choice in sealed users/<id>/settings/, reapplies at sign-in + display restart

scripts/make-disk-image.sh

@@ -39,7 +39,7 @@ staged() {
 
 # Each user's folder in users/ is encrypted, so not filled here: init seeds
 # a new user's areas from factory/ (plaintext) once they are signed in.
-mkdir -p "${ROOT}/bin" "${ROOT}/apps" "${ROOT}/users" "${ROOT}/factory/home" "${ROOT}/factory/permissions" "${ROOT}/factory/data" "${ROOT}/factory/apps"
+mkdir -p "${ROOT}/bin" "${ROOT}/apps" "${ROOT}/users" "${ROOT}/factory/home" "${ROOT}/factory/permissions" "${ROOT}/factory/data" "${ROOT}/factory/apps" "${ROOT}/factory/settings"
 # System servers and the shell: init starts these.
 copy display-qemu       display
 copy input-qemu         input
@@ -59,6 +59,7 @@ app settings
 staged counter inbox/counter
 # A user's first files.
 cp -r disk/home/. "${ROOT}/factory/home/"
+mkdir -p "${ROOT}/themes" && cp disk/themes/*.toml "${ROOT}/themes/"
 # Only the test image: its presence makes init run the self-test.
 if [ -n "${SMPTEST:-}" ]; then
     copy smptest   smptest