fix: wordcloud auto-fit all words with shrinkToFit

- shrinkToFit: true — auto-shrink words that don't fit
- width/height: 95% — use nearly full container
- keepAspect: false — let shape stretch to fill container
- Combined with ellipse mask radii, all words should now display

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/adapters/gateways/EChartsOptionBuilder/wordcloudOptionBuilder.ts

@@ -230,16 +230,17 @@ export function buildWordcloudOption(
   const series: Record<string, any> = {
     type: 'wordCloud',
     left: 'center',
-    top: style.title?.visible ? 40 : 'center',
-    width: '85%',
-    height: style.title?.visible ? '80%' : '90%',
+    top: style.title?.visible ? 35 : 'center',
+    width: '95%',
+    height: style.title?.visible ? '85%' : '95%',
     sizeRange: [wc.sizeMin, wc.sizeMax],
     rotationRange: [wc.rotationMin, wc.rotationMax],
     rotationStep: wc.rotationStep || 1,
     gridSize: wc.gridSize,
+    shrinkToFit: true,
     drawOutOfBound: false,
     layoutAnimation: true,
-    keepAspect: true,
+    keepAspect: false,
     textStyle: {
       fontFamily: wc.fontFamily,
       fontWeight: wc.fontWeight,