fix: Pixel-Analyse nicht mehr ueberspringen wenn Cluster < Gruppen

Vorher: wenn Text mehr Wort-Gruppen hatte als Pixel-Cluster gefunden
wurden (z.B. bei Box-Rahmen die Cluster zusammenmergen), wurde die
Zelle komplett uebersprungen → Fallback bei x=0%.

Jetzt: Fallback auf Single-Span Positionierung (first→last Cluster)
statt Skip. Damit wird der Text immer korrekt horizontal platziert.

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

admin-lehrer/components/ocr-overlay/usePixelWordPositions.ts

@@ -126,20 +126,8 @@ export function usePixelWordPositions(
 
         const wordPos: WordPosition[] = []
 
-        if (groups.length <= 1) {
-          const firstCl = clusters[0]
-          const lastCl = clusters[clusters.length - 1]
-          const clusterW = lastCl.end - firstCl.start + 1
-          const measured = ctx.measureText(cell.text.trim())
-          const autoFontPx = refFontSize * (clusterW / measured.width)
-          const fontRatio = Math.min(autoFontPx / ch, 1.0)
-          wordPos.push({
-            xPct: cell.bbox_pct.x + (firstCl.start / cw) * cell.bbox_pct.w,
-            wPct: ((lastCl.end - firstCl.start + 1) / cw) * cell.bbox_pct.w,
-            text: cell.text.trim(),
-            fontRatio,
-          })
-        } else if (clusters.length >= groups.length) {
+        if (groups.length > 1 && clusters.length >= groups.length) {
+          // Multiple text groups with enough clusters: map each group to a cluster
           for (let i = 0; i < groups.length; i++) {
             const cl = clusters[i]
             const clusterW = cl.end - cl.start + 1
@@ -154,7 +142,20 @@ export function usePixelWordPositions(
             })
           }
         } else {
-          continue
+          // Single group OR clusters don't match groups:
+          // position entire text as one span from first to last cluster
+          const firstCl = clusters[0]
+          const lastCl = clusters[clusters.length - 1]
+          const clusterW = lastCl.end - firstCl.start + 1
+          const measured = ctx.measureText(cell.text.trim())
+          const autoFontPx = refFontSize * (clusterW / measured.width)
+          const fontRatio = Math.min(autoFontPx / ch, 1.0)
+          wordPos.push({
+            xPct: cell.bbox_pct.x + (firstCl.start / cw) * cell.bbox_pct.w,
+            wPct: ((lastCl.end - firstCl.start + 1) / cw) * cell.bbox_pct.w,
+            text: cell.text.trim(),
+            fontRatio,
+          })
         }
 
         positions.set(cell.cell_id, wordPos)