feat(k-ui): first slice: App trait + run loop, builders (column/row/text/button), flex layout, theme tokens (Whimsy Dark), tiny-skia + fontdue render (Noto Sans Latin subset), keyboard focus ring; tally demo; manifest memory key (pm spawns with it)

crates/init/src/manifest.rs

@@ -138,7 +138,7 @@ pub const SESSION: &[Program] = &[Program {
     uses: &["terminal", "display"],
     storage: &[users(b"", true), disk(b"apps", false)],
     // Room for a few apps at a time.
-    spawns: Some(Limits { pages: 512, endpoints: 8, notifications: 8, regions: 8 }),
+    spawns: Some(Limits { pages: 2048, endpoints: 8, notifications: 8, regions: 8 }),
     // The shell holds handles to the apps it ran, which die with it.
     restarts_clients: true,
     // Installing waits for the user's consent.