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/simplehtml/mod.rs

@@ -327,6 +327,7 @@ fn build(model: &mut Model, fh: FrameHandle, blocks: &[Block]) {
                 d.font_explicit.justify_h = true;
                 d.font_explicit.justify_v = true;
                 model.region_data.insert(rh, d);
+                model.touch_measure(rh); // a text block arrives text-in-hand
                 prev_block = Some(id);
                 next_y = -paint.spacing;
                 made.push(rh);