the interface labels announce their writes, and the idle tick goes quiet

- a text write names its own label, so the per-frame measure sweep drains a short ledger instead of hashing every font string twice — ~0.3 ms a frame at the Stormwind gates, gone
- the idle interface tick stops re-writing settled state: buff durations and the weapon-enchant frame write only on change, and the fade and unit-popup drivers park until woken
- the interface extract skips a hidden region before cloning its row, not after
- WOW_UPLOAD_BUDGET=<MB> brackets the arrival burst's upload pacing — a lever for measuring world entry, not a fix yet

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/benilla-ui/src/script/object/frame_state.rs

@@ -286,8 +286,10 @@ pub(super) fn install(lua: &Lua, m: &Table) -> mlua::Result<()> {
                 let mut model = lua.app_data_mut::<Model>().expect("model");
                 let shown = model.arena.reparent_finish(h, new_parent, was_visible);
                 // A real reparent moves the subtree's effective scale and anchors — a
-                // layout-gate input.
+                // layout-gate input, and the scale is a measure-key input the subtree's
+                // FontStrings cannot name one by one (human-rate; the sweep walks once).
                 model.touch_layout();
+                model.touch_measure_all();
                 shown
             };
             event::fire_visibility_changes(lua, shown);
@@ -350,6 +352,8 @@ pub(super) fn install(lua: &Lua, m: &Table) -> mlua::Result<()> {
             model.arena.set_scale(h, scale);
             if changed {
                 model.touch_layout();
+                // The owner's effective scale is in every descendant FontString's measure key.
+                model.touch_measure_all();
             }
             Ok(())
         })?,