fix(studio): fit default text to production font metrics

apps/studio/src/lib/native-layout.ts

@@ -42,9 +42,12 @@ export function textSize(layout:Layout,slot:Slot,text:string):number {
  const [, ,w,h]=slot.box,lines=text.split('\n');
  const length=(s:string)=>Array.from(s).reduce((n,c)=>n+(/[\u3400-\u9fff]/.test(c)?1:/[A-Z]/.test(c)?.8:.6),0);
  if(slot.direction==='vertical')return Math.min(w*.75,h/Math.max(1,Array.from(text.replaceAll('\n','')).length)*.88);
- if(slot.direction==='rotated')return Math.min(w*.85,h/Math.max(1,length(text)));
+ // Linux's fallback glyphs extend beyond the nominal vertical line box.
+ if(slot.direction==='rotated')return Math.min(w*.78,h/Math.max(1,length(text)));
  if(slot.direction==='curved')return Math.min(2.2,Math.max(w,h)*1.1/Math.max(1,length(text)));
- const fitted=Math.min(h/(lines.length*1.15),w/Math.max(1,...lines.map(length)))*.92;
+ // Budget for fallback glyph ascent/descent, not just the CSS 1.2 line-height.
+ // The production Chromium/Noto stack needs about 1.33 em for a visible line.
+ const fitted=Math.min(h/(lines.length*1.4),w/Math.max(1,...lines.map(length)))*.92;
  return /微字|脚注|图注|标签/.test(slot.role)?Math.min(fitted,2.2):fitted;
 }
 export function imageShape(layout:Layout,slot:Slot):CSSProperties {

apps/studio/tests/native-layout.test.mjs

@@ -17,3 +17,15 @@ test('geometric templates retain their distinct silhouettes without bitmap masks
 });
 
 test('element IDs work on HTTP origins without secure-context randomUUID',()=>{const saved=Object.getOwnPropertyDescriptor(globalThis,'crypto');let calls=0;Object.defineProperty(globalThis,'crypto',{configurable:true,value:{getRandomValues(array){for(let i=0;i<array.length;i++)array[i]=++calls;return array}}});try{const first=newElementId(),second=newElementId();assert.match(first,/^user-[a-f0-9]{32}$/);assert.notEqual(first,second)}finally{Object.defineProperty(globalThis,'crypto',saved)}});
+
+// Measured by ces-control Chromium/Noto in production run 660, at 860px art width.
+// These glyph bounds exceed CSS line-height, including single-letter title slots.
+test('default copy leaves room for production fallback glyph bounds',()=>{
+ const cases=[['ref-07','T02',97/73.7143],['ref-08','T01',112/85.2389],['ref-19','T01',287/217.055],['ref-19','T02',298/225.274],['ref-19','T03',313/237.451],['ref-19','T04',306/231.363],['ref-21','T01',195/160.307]];
+ for(const [id,slotId,glyphExtent] of cases){
+  const layout=layouts.find(l=>l.id===id),slot=layout.elements.find(s=>s.id===slotId);
+  const size=textSize(layout,slot,defaultText(layout,slot))*860/layout.width;
+  const crossAxis=slot.direction==='rotated'?slot.box[2]:slot.box[3];
+  assert.ok(Math.ceil(size*glyphExtent)<=crossAxis*860/layout.width+2,`${id}/${slotId}: fallback glyphs must fit`);
+ }
+});