fix(viewer2d): correct Slug GPU text scale to match DWG cap-height

SlugTextBatch.add() scaled em-unit glyph outlines by the raw DWG
`height` value, but glyph ink only reaches capHeightEm (~0.74 em) of
the em box. Rendered cap height ended up ~26% short of spec (e.g. a
3.6-height TABLE cell text rendered at ~2.68), while the canvas-sprite
fallback already corrected for this via measured ascent. Divide by
capHeightEm so both paths agree.

Rebuilds dist2 (was stale since before the Entity selection/Property
Inspector/Layer panel work landed).

src/viewer2d/slugText.ts

@@ -328,7 +328,10 @@ export class SlugTextBatch {
       colorInt: number, alignH: number, alignV: number): void {
     const eng = this.engine;
     const lines = String(text).split('\n');
-    const scale = height;
+    // Glyph outlines are em-scaled (getPath(0,0,1)), so raw cap ink height is
+    // capHeightEm em, not 1em. Divide by it so the rendered cap height equals
+    // the DWG `height` field, matching the canvas-sprite fallback's ascent fit.
+    const scale = height / eng.capHeightEm;
     const lineStep = height * 5 / 3; // CAD default MTEXT line spacing
     const blockH = (lines.length - 1) * lineStep + height;