SpreadsheetView: auto-fit column widths to longest text

Column widths now calculated from the longest text in each column
(~7.5px per character + padding). Takes the maximum of auto-fit
width and scaled original pixel width.

Multi-line cells: uses the longest line for width calculation.
Spanning header cells excluded from width calculation (they span
multiple columns and would inflate single-column widths).

Minimum column width: 60px.

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

admin-lehrer/components/ocr-kombi/SpreadsheetView.tsx

@@ -113,12 +113,28 @@ function zoneToSheet(zone: GridZone, sheetIndex: number, isFirst: boolean): any
     }
   }
 
-  // Column widths — optimized per zone
+  // Column widths — auto-fit based on longest text in each column
   const columnlen: Record<string, number> = {}
   for (const col of (zone.columns || [])) {
+    // Find the longest text in this column (considering only non-spanning cells)
+    const colCells = (zone.cells || []).filter(
+      (c: any) => c.col_index === col.index && c.col_type !== 'spanning_header'
+    )
+    let maxTextLen = 0
+    for (const c of colCells) {
+      const text = c.text ?? ''
+      // For multi-line cells, use the longest line
+      const lines = text.split('\n')
+      const longestLine = Math.max(0, ...lines.map((l: string) => l.length))
+      if (longestLine > maxTextLen) maxTextLen = longestLine
+    }
+    // ~7px per character as a rough estimate, minimum 60px
+    const autoWidth = Math.max(60, maxTextLen * 7.5 + 16)
+    // Also consider original pixel width (scaled down)
     const pxW = (col.x_max_px ?? 0) - (col.x_min_px ?? 0)
-    const scaleFactor = numCols <= 2 ? 0.6 : 0.4
-    columnlen[String(col.index)] = Math.max(80, Math.round(pxW * scaleFactor))
+    const scaledPxW = Math.max(60, Math.round(pxW * (numCols <= 2 ? 0.6 : 0.4)))
+    // Use the larger of auto-fit or scaled pixel width
+    columnlen[String(col.index)] = Math.round(Math.max(autoWidth, scaledPxW))
   }
 
   // Row heights — taller for multi-line cells