fix: Schriftgroesse auf haeufigsten Wert (Mode) normalisieren

Alle Wortgruppen bekommen die gleiche fontRatio (gerundet auf 0.02),
basierend auf der haeufigsten berechneten Groesse. Ueberschriften
und Fliesstext haben damit einheitliche Schriftgroesse.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-lehrer/components/ocr-pipeline/StepLlmReview.tsx

@@ -221,6 +221,29 @@ export function StepLlmReview({ sessionId, onNext }: StepLlmReviewProps) {
         positions.set(cell.cell_id, wordPos)
       }
 
+      // Normalise: find the most common fontRatio (mode) and apply it to all
+      const allRatios: number[] = []
+      for (const wps of positions.values()) {
+        for (const wp of wps) allRatios.push(wp.fontRatio)
+      }
+      if (allRatios.length > 0) {
+        // Bucket ratios to 2 decimal places, find mode
+        const buckets = new Map<number, number>()
+        for (const r of allRatios) {
+          const key = Math.round(r * 50) / 50 // round to nearest 0.02
+          buckets.set(key, (buckets.get(key) || 0) + 1)
+        }
+        let modeRatio = allRatios[0]
+        let modeCount = 0
+        for (const [ratio, count] of buckets) {
+          if (count > modeCount) { modeRatio = ratio; modeCount = count }
+        }
+        // Apply mode to all word positions
+        for (const wps of positions.values()) {
+          for (const wp of wps) wp.fontRatio = modeRatio
+        }
+      }
+
       setCellWordPositions(positions)
     }
     img.src = imgUrl