ludic.ui: splits, words, gradients and keys are made once per text (a bounded memo), sides without a list - benchmark 110 -> 63 KB a frame

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ludic.ui/backend.ludic

@@ -34,6 +34,8 @@ function ui_default_backend() -> UiBackend {
 export state UiState {
   pl_pools: []UiPool = new []UiPool      # pool.ludic: each screen's nodes and envs, used again
   pl_cur: UiPool = null
+  mm: UiMemo = null                      # memo.ludic: splits, gradients and keys by their text
+  mm_ints: []string = null
   an_frames: []UiKeyframes = new []UiKeyframes
   an_keys: []string = new []string
   an_start: []float = new []float