Drop the last thing nothing reads

`Painter::text_data` had no caller. It was left in the previous round because
it is the only way a widget inside `draw` can reach `TextData`, and the app's
pending integration might have wanted it; nothing in iris is kept for the
app's sake, since the app is to be largely rewritten against this API rather
than ported call by call (Bryan, 2026-09-20).

core/src/ui/painter.rs

@@ -2,8 +2,8 @@
 use crate::layout_diagnostics::{self as diag, Counter};
 use crate::{
     Axis, Declared, Holds, LayoutHolds, LayoutLen, Len, PlaceDesc, Px, PxVec2, RegionAlign, Rel,
-    RenderedText, RetainedPrimitive, Size, StrongWidget, TextAttrs, TextBuffer, TextData,
-    TextureHandle, UiRegion, UiRenderState, UiRsc, UiVec2, Weight, WidgetId, Widgets,
+    RenderedText, RetainedPrimitive, Size, StrongWidget, TextAttrs, TextBuffer, TextureHandle,
+    UiRegion, UiRenderState, UiRsc, UiVec2, Weight, WidgetId, Widgets,
     render::{
         GlyphPrimitive, Mask, MaskIdx, MoveIdx, Primitive, PrimitiveInst, PrimitiveKind,
         TexturePrimitive,
@@ -497,10 +497,6 @@ impl<'a> Painter<'a> {
         self.own[axis].window = holds;
     }
 
-    pub fn text_data(&mut self) -> &mut TextData {
-        &mut self.rsc.ui_mut().text
-    }
-
     pub fn child_layer(&mut self) {
         self.layer = self.state.layers.child(self.layer);
     }