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

crates/manifest/src/lib.rs

@@ -9,7 +9,7 @@ mod capability;
 mod decision;
 mod fields;
 mod manifest;
-mod toml;
+pub mod toml;
 
 #[cfg(test)]
 mod tests;