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

Cargo.lock

@@ -242,6 +242,7 @@ dependencies = [
  "port-framebuffer",
  "raster",
  "server-framework",
+ "theme",
  "types",
 ]
 
@@ -467,6 +468,7 @@ dependencies = [
  "libkos",
  "libm",
  "port-framebuffer",
+ "theme",
  "tiny-skia",
  "types",
 ]
@@ -757,6 +759,15 @@ dependencies = [
  "types",
 ]
 
+[[package]]
+name = "theme"
+version = "0.1.0"
+dependencies = [
+ "libm",
+ "manifest",
+ "types",
+]
+
 [[package]]
 name = "tiny-skia"
 version = "0.11.4"