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/init/src/manifest.rs

@@ -111,13 +111,15 @@ pub const SERVERS: &[Program] = &[
     Program {
         devices: &[Device::Gpu],
         uses: &["input"],
+        // The themes, read once at start.
+        storage: &[disk(b"themes", false)],
         // Its clients subscribe and take focus.
         restarts_clients: true,
         // Its windows' state (input queues among it) is KiBs.
         stack_pages: 8,
         // The framebuffer is ~1000 pages at 1280x800, and so is each of
         // the (at most 4) windows' pixel buffers, which it owns.
-        ..server("display", b"bin/display", Limits { pages: 5200, regions: 8, ..SMALL })
+        ..server("display", b"bin/display", Limits { pages: 5200, regions: 9, ..SMALL })
     },
     // Text on the display, lines from the keyboard (it takes input focus).
     // Its clients wait on lines and Ctrl+C. It draws its own text now,