chore: add TextSpan clip_extents (new required cce-ui field)

cce-ui's TextSpan gained a rounded-rect clip half-extents field; zero
keeps the span unclipped as before.

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/main.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main.rs b/src/main.rs
index d54ef41..ec6d907 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1267,6 +1267,7 @@ impl State {
                 ],
                 rotation: None,
                 clip_circle: [0.0; 3],
+                clip_extents: [0.0; 2],
             })
             .collect();