StepAnsicht: section-based layout with averaged row heights

Major rewrite of reconstruction rendering:
- Page split into vertical sections (content/box) around box boundaries
- Content sections: uniform row height = (last_row - first_row) / (n-1)
- Box sections: rows evenly distributed within box height
- Content rows positioned absolutely at original y-coordinates
- Font size derived from row height (55% of row height)
- Multi-line cells (bullets) get expanded height with indentation
- Boxes render at exact bbox position with colored border
- Preparation for unified grid where boxes become part of main grid

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

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

@@ -3,15 +3,18 @@
 /**
  * StepAnsicht — Split-view page layout comparison.
  *
- * Left:  Original scan with OCR word overlay (red) + coordinate grid
- * Right: Reconstructed layout with all zones + coordinate grid
+ * Left:  Original scan with OCR word overlay
+ * Right: Reconstructed layout with averaged row heights per section
  *
- * Both sides share the same coordinate system for easy visual comparison.
+ * Layout principle: the page is divided into vertical sections separated
+ * by boxes.  Each section gets a uniform row height calculated from
+ * (last_row_y - first_row_y) / (num_rows - 1).  Boxes are rendered
+ * inline between sections (not as floating overlays).
  */
 
-import { useEffect, useRef, useState } from 'react'
+import { useEffect, useMemo, useRef, useState } from 'react'
 import { useGridEditor } from '@/components/grid-editor/useGridEditor'
-import type { GridZone, GridEditorCell } from '@/components/grid-editor/types'
+import type { GridZone, GridEditorCell, GridRow } from '@/components/grid-editor/types'
 
 const KLAUSUR_API = '/klausur-api'
 
@@ -20,6 +23,16 @@ interface StepAnsichtProps {
   onNext: () => void
 }
 
+/** A vertical section of the page: either content rows or a box zone. */
+interface PageSection {
+  type: 'content' | 'box'
+  yStart: number   // pixel y in original image
+  yEnd: number     // pixel y end
+  zone?: GridZone  // for box sections
+  rows?: GridRow[] // for content sections — subset of content zone rows
+  avgRowH: number  // averaged row height in original pixels
+}
+
 function getCellColor(cell: GridEditorCell | undefined): string | null {
   if (!cell) return null
   if (cell.color_override) return cell.color_override
@@ -33,13 +46,12 @@ export function StepAnsicht({ sessionId, onNext }: StepAnsichtProps) {
   const leftRef = useRef<HTMLDivElement>(null)
   const [panelWidth, setPanelWidth] = useState(0)
   const [showGrid, setShowGrid] = useState(true)
-  const [gridSpacing, setGridSpacing] = useState(100) // px in original coordinates
+  const [gridSpacing, setGridSpacing] = useState(100)
 
   useEffect(() => {
     if (sessionId) loadGrid()
   }, [sessionId]) // eslint-disable-line react-hooks/exhaustive-deps
 
-  // Track panel width
   useEffect(() => {
     if (!leftRef.current) return
     const ro = new ResizeObserver(([entry]) => setPanelWidth(entry.contentRect.width))
@@ -47,6 +59,85 @@ export function StepAnsicht({ sessionId, onNext }: StepAnsichtProps) {
     return () => ro.disconnect()
   }, [])
 
+  // Build page sections: split content rows around box zones
+  const sections = useMemo(() => {
+    if (!grid) return []
+    const contentZone = grid.zones.find((z) => z.zone_type === 'content')
+    const boxZones = grid.zones.filter((z) => z.zone_type === 'box')
+      .sort((a, b) => a.bbox_px.y - b.bbox_px.y)
+
+    if (!contentZone) return []
+
+    const allRows = contentZone.rows
+    const result: PageSection[] = []
+
+    // Box boundaries sorted by y
+    const boxBounds = boxZones.map((bz) => ({
+      zone: bz,
+      yStart: bz.bbox_px.y,
+      yEnd: bz.bbox_px.y + bz.bbox_px.h,
+    }))
+
+    // Split content rows into sections around boxes
+    let currentRows: GridRow[] = []
+    let boxIdx = 0
+
+    for (const row of allRows) {
+      const ry = row.y_min_px ?? (row as any).y_min ?? 0
+
+      // Check if we've passed a box boundary — insert box section
+      while (boxIdx < boxBounds.length && ry >= boxBounds[boxIdx].yStart) {
+        // Flush current content section
+        if (currentRows.length > 0) {
+          result.push(makeContentSection(currentRows))
+          currentRows = []
+        }
+        // Insert box section
+        const bb = boxBounds[boxIdx]
+        const bRows = bb.zone.rows || []
+        let bAvgH = 35
+        if (bRows.length >= 2) {
+          const bys = bRows.map((r) => r.y_min_px ?? (r as any).y_min ?? 0)
+          bAvgH = (bys[bys.length - 1] - bys[0]) / (bRows.length - 1)
+        }
+        result.push({
+          type: 'box',
+          yStart: bb.yStart,
+          yEnd: bb.yEnd,
+          zone: bb.zone,
+          avgRowH: bAvgH,
+        })
+        boxIdx++
+      }
+
+      // Skip rows that fall inside a box boundary
+      const insideBox = boxBounds.some((bb) => ry >= bb.yStart && ry <= bb.yEnd)
+      if (!insideBox) {
+        currentRows.push(row)
+      }
+    }
+
+    // Flush remaining content rows
+    if (currentRows.length > 0) {
+      result.push(makeContentSection(currentRows))
+    }
+
+    // Insert remaining boxes (if any rows didn't trigger them)
+    while (boxIdx < boxBounds.length) {
+      const bb = boxBounds[boxIdx]
+      const bRows = bb.zone.rows || []
+      let bAvgH = 35
+      if (bRows.length >= 2) {
+        const bys = bRows.map((r) => r.y_min_px ?? (r as any).y_min ?? 0)
+        bAvgH = (bys[bys.length - 1] - bys[0]) / (bRows.length - 1)
+      }
+      result.push({ type: 'box', yStart: bb.yStart, yEnd: bb.yEnd, zone: bb.zone, avgRowH: bAvgH })
+      boxIdx++
+    }
+
+    return result
+  }, [grid])
+
   if (loading) {
     return (
       <div className="flex items-center justify-center py-16">
@@ -69,82 +160,79 @@ export function StepAnsicht({ sessionId, onNext }: StepAnsichtProps) {
   const imgH = grid.image_height || 1
   const scale = panelWidth > 0 ? panelWidth / imgW : 0.5
   const panelHeight = imgH * scale
-
-  const baseFontPx = (grid as any).layout_metrics?.font_size_suggestion_px || 14
-  const avgRowH = (grid as any).layout_metrics?.avg_row_height_px || 31
-  const scaledFont = Math.max(7, baseFontPx * scale)
+  const contentZone = grid.zones.find((z) => z.zone_type === 'content')
 
   return (
     <div className="space-y-3">
       {/* Header */}
       <div className="flex items-center justify-between">
         <div>
-          <h3 className="text-lg font-semibold text-gray-900 dark:text-white">
-            Ansicht — Original vs. Rekonstruktion
-          </h3>
+          <h3 className="text-lg font-semibold text-gray-900 dark:text-white">Ansicht — Original vs. Rekonstruktion</h3>
           <p className="text-sm text-gray-500 dark:text-gray-400">
-            Links: Original mit OCR-Overlay. Rechts: Rekonstruierte Seite. Koordinatengitter zum Abgleich.
+            Links: Original mit OCR. Rechts: Rekonstruktion mit gemittelten Zeilenhöhen.
           </p>
         </div>
         <div className="flex items-center gap-2">
           <label className="flex items-center gap-1.5 text-xs text-gray-500">
-            <input
-              type="checkbox"
-              checked={showGrid}
-              onChange={(e) => setShowGrid(e.target.checked)}
-              className="w-3.5 h-3.5 rounded border-gray-300"
-            />
+            <input type="checkbox" checked={showGrid} onChange={(e) => setShowGrid(e.target.checked)} className="w-3.5 h-3.5 rounded" />
             Gitter
           </label>
-          <select
-            value={gridSpacing}
-            onChange={(e) => setGridSpacing(Number(e.target.value))}
-            className="text-xs px-1.5 py-1 rounded border border-gray-300 dark:border-gray-600 bg-white dark:bg-gray-700"
-          >
+          <select value={gridSpacing} onChange={(e) => setGridSpacing(Number(e.target.value))} className="text-xs px-1.5 py-1 rounded border border-gray-300 dark:border-gray-600 bg-white dark:bg-gray-700">
             <option value={50}>50px</option>
             <option value={100}>100px</option>
             <option value={200}>200px</option>
           </select>
-          <button onClick={onNext} className="px-5 py-2 bg-teal-600 text-white rounded-lg hover:bg-teal-700 text-sm font-medium">
-            Weiter →
-          </button>
+          <button onClick={onNext} className="px-5 py-2 bg-teal-600 text-white rounded-lg hover:bg-teal-700 text-sm font-medium">Weiter →</button>
         </div>
       </div>
 
       {/* Split view */}
-      <div className="flex gap-2" style={{ height: panelHeight > 0 ? `${panelHeight + 40}px` : '600px' }}>
+      <div className="flex gap-2" style={{ height: `${panelHeight + 40}px` }}>
         {/* LEFT: Original + OCR overlay */}
         <div ref={leftRef} className="flex-1 relative border border-gray-300 dark:border-gray-600 rounded-lg overflow-hidden bg-white dark:bg-gray-900">
-          <div className="absolute top-0 left-0 px-2 py-0.5 bg-black/60 text-white text-[10px] font-medium rounded-br z-20">
-            Original + OCR
-          </div>
-
-          {/* Server-rendered OCR overlay image (scan + red snapped letters) */}
+          <div className="absolute top-0 left-0 px-2 py-0.5 bg-black/60 text-white text-[10px] font-medium rounded-br z-20">Original + OCR</div>
           {sessionId && (
             <img
               src={`${KLAUSUR_API}/api/v1/ocr-pipeline/sessions/${sessionId}/image/words-overlay`}
-              alt="Original + OCR Overlay"
+              alt="Original + OCR"
               className="absolute inset-0 w-full h-auto"
               style={{ height: `${panelHeight}px`, objectFit: 'contain' }}
             />
           )}
-
-          {/* Coordinate grid */}
           {showGrid && <CoordinateGrid imgW={imgW} imgH={imgH} scale={scale} spacing={gridSpacing} />}
         </div>
 
         {/* RIGHT: Reconstruction */}
         <div className="flex-1 relative border border-gray-300 dark:border-gray-600 rounded-lg overflow-hidden bg-white dark:bg-gray-900">
-          <div className="absolute top-0 left-0 px-2 py-0.5 bg-teal-600/80 text-white text-[10px] font-medium rounded-br z-20">
-            Rekonstruktion
-          </div>
+          <div className="absolute top-0 left-0 px-2 py-0.5 bg-teal-600/80 text-white text-[10px] font-medium rounded-br z-20">Rekonstruktion</div>
 
-          {/* Rendered zones */}
-          {grid.zones.map((zone) => (
-            <ZoneRenderer key={zone.zone_index} zone={zone} scale={scale} fontSize={scaledFont} avgRowH={avgRowH} />
-          ))}
+          {/* Render sections sequentially */}
+          {sections.map((sec, si) => {
+            if (sec.type === 'box' && sec.zone) {
+              return (
+                <BoxSectionRenderer
+                  key={`box-${si}`}
+                  zone={sec.zone}
+                  scale={scale}
+                  avgRowH={sec.avgRowH}
+                />
+              )
+            }
+            if (sec.type === 'content' && sec.rows && contentZone) {
+              return (
+                <ContentSectionRenderer
+                  key={`sec-${si}`}
+                  zone={contentZone}
+                  rows={sec.rows}
+                  yStart={sec.yStart}
+                  scale={scale}
+                  avgRowH={sec.avgRowH}
+                />
+              )
+            }
+            return null
+          })}
 
-          {/* Coordinate grid */}
           {showGrid && <CoordinateGrid imgW={imgW} imgH={imgH} scale={scale} spacing={gridSpacing} />}
         </div>
       </div>
@@ -153,70 +241,133 @@ export function StepAnsicht({ sessionId, onNext }: StepAnsichtProps) {
 }
 
 // ---------------------------------------------------------------------------
-// Coordinate grid overlay
+// Helpers
 // ---------------------------------------------------------------------------
 
-function CoordinateGrid({ imgW, imgH, scale, spacing }: {
-  imgW: number; imgH: number; scale: number; spacing: number
-}) {
-  const lines: JSX.Element[] = []
-
-  // Vertical lines
-  for (let x = 0; x <= imgW; x += spacing) {
-    const px = x * scale
-    lines.push(
-      <div key={`v${x}`} className="absolute top-0 bottom-0 pointer-events-none" style={{ left: `${px}px`, width: '1px', background: 'rgba(0,150,255,0.2)' }}>
-        <span className="absolute top-0 left-1 text-[8px] text-blue-400 font-mono">{x}</span>
-      </div>
-    )
+function makeContentSection(rows: GridRow[]): PageSection {
+  const ys = rows.map((r) => r.y_min_px ?? (r as any).y_min ?? 0)
+  const yEnd = rows[rows.length - 1].y_max_px ?? (rows[rows.length - 1] as any).y_max ?? ys[ys.length - 1] + 30
+  let avgRowH = 35
+  if (rows.length >= 2) {
+    avgRowH = (ys[ys.length - 1] - ys[0]) / (rows.length - 1)
   }
-
-  // Horizontal lines
-  for (let y = 0; y <= imgH; y += spacing) {
-    const px = y * scale
-    lines.push(
-      <div key={`h${y}`} className="absolute left-0 right-0 pointer-events-none" style={{ top: `${px}px`, height: '1px', background: 'rgba(0,150,255,0.2)' }}>
-        <span className="absolute left-1 top-0.5 text-[8px] text-blue-400 font-mono">{y}</span>
-      </div>
-    )
-  }
-
-  return <>{lines}</>
+  return { type: 'content', yStart: ys[0], yEnd, rows, avgRowH }
 }
 
 // ---------------------------------------------------------------------------
-// Zone renderer (reconstruction side)
+// Content section renderer — rows from content zone at absolute positions
 // ---------------------------------------------------------------------------
 
-function ZoneRenderer({ zone, scale, fontSize, avgRowH }: {
-  zone: GridZone; scale: number; fontSize: number; avgRowH: number
+function ContentSectionRenderer({ zone, rows, yStart, scale, avgRowH }: {
+  zone: GridZone; rows: GridRow[]; yStart: number; scale: number; avgRowH: number
 }) {
-  const isBox = zone.zone_type === 'box'
-  const boxColor = (zone as any).box_bg_hex || '#6b7280'
+  const cellMap = new Map<string, GridEditorCell>()
+  for (const cell of zone.cells) {
+    cellMap.set(`${cell.row_index}_${cell.col_index}`, cell)
+  }
 
+  const rowH = avgRowH * scale
+  const fontSize = Math.max(7, rowH * 0.55)
+
+  return (
+    <>
+      {rows.map((row, ri) => {
+        const rowY = (row.y_min_px ?? (row as any).y_min ?? 0) * scale
+        const isSpanning = zone.cells.some((c) => c.row_index === row.index && c.col_type === 'spanning_header')
+
+        // Column widths
+        const colWidths = zone.columns.map((col) => Math.max(5, ((col.x_max_px ?? 0) - (col.x_min_px ?? 0)) * scale))
+        const zoneLeft = zone.bbox_px.x * scale
+        const zoneWidth = zone.bbox_px.w * scale
+        const totalColW = colWidths.reduce((s, w) => s + w, 0)
+        const colScale = totalColW > 0 ? zoneWidth / totalColW : 1
+
+        return (
+          <div
+            key={row.index}
+            className="absolute"
+            style={{
+              left: `${zoneLeft}px`,
+              top: `${rowY}px`,
+              width: `${zoneWidth}px`,
+              height: `${rowH}px`,
+              display: 'grid',
+              gridTemplateColumns: colWidths.map((w) => `${(w * colScale).toFixed(1)}px`).join(' '),
+              fontSize: `${fontSize}px`,
+              lineHeight: `${rowH}px`,
+            }}
+          >
+            {isSpanning ? (
+              zone.cells
+                .filter((c) => c.row_index === row.index && c.col_type === 'spanning_header')
+                .sort((a, b) => a.col_index - b.col_index)
+                .map((cell) => {
+                  const colspan = cell.colspan || zone.columns.length
+                  const color = getCellColor(cell)
+                  return (
+                    <div
+                      key={cell.cell_id}
+                      className={`overflow-hidden ${row.is_header ? 'font-bold' : ''}`}
+                      style={{ gridColumn: `${cell.col_index + 1} / ${cell.col_index + 1 + colspan}`, color: color || undefined }}
+                    >
+                      {cell.text}
+                    </div>
+                  )
+                })
+            ) : (
+              zone.columns.map((col) => {
+                const cell = cellMap.get(`${row.index}_${col.index}`)
+                const color = getCellColor(cell)
+                const isBold = col.bold || cell?.is_bold || row.is_header
+                return (
+                  <div
+                    key={col.index}
+                    className={`overflow-hidden text-ellipsis whitespace-nowrap ${isBold ? 'font-bold' : ''}`}
+                    style={{ color: color || undefined }}
+                  >
+                    {cell?.text ?? ''}
+                  </div>
+                )
+              })
+            )}
+          </div>
+        )
+      })}
+    </>
+  )
+}
+
+// ---------------------------------------------------------------------------
+// Box section renderer — box zone at absolute position with border
+// ---------------------------------------------------------------------------
+
+function BoxSectionRenderer({ zone, scale, avgRowH }: {
+  zone: GridZone; scale: number; avgRowH: number
+}) {
+  const boxColor = (zone as any).box_bg_hex || '#6b7280'
   if (!zone.cells || zone.cells.length === 0) return null
 
   const left = zone.bbox_px.x * scale
   const top = zone.bbox_px.y * scale
   const width = zone.bbox_px.w * scale
   const height = zone.bbox_px.h * scale
+  const rowH = avgRowH * scale
+  const fontSize = Math.max(7, rowH * 0.5)
 
   const cellMap = new Map<string, GridEditorCell>()
   for (const cell of zone.cells) {
     cellMap.set(`${cell.row_index}_${cell.col_index}`, cell)
   }
 
-  // Column widths scaled to zone
-  const colWidths = zone.columns.map((col) => {
-    const w = (col.x_max_px ?? 0) - (col.x_min_px ?? 0)
-    return Math.max(5, w * scale)
-  })
+  const colWidths = zone.columns.map((col) => Math.max(5, ((col.x_max_px ?? 0) - (col.x_min_px ?? 0)) * scale))
   const totalColW = colWidths.reduce((s, w) => s + w, 0)
   const colScale = totalColW > 0 ? width / totalColW : 1
-  const scaledColWidths = colWidths.map((w) => w * colScale)
-
   const numCols = zone.columns.length
 
+  // Evenly distribute rows within the box
+  const numRows = zone.rows.length
+  const evenRowH = numRows > 0 ? height / numRows : rowH
+
   return (
     <div
       className="absolute overflow-hidden"
@@ -224,31 +375,23 @@ function ZoneRenderer({ zone, scale, fontSize, avgRowH }: {
         left: `${left}px`,
         top: `${top}px`,
         width: `${width}px`,
-        minHeight: `${height}px`,
-        border: isBox ? `${Math.max(1.5, 2.5 * scale)}px solid ${boxColor}` : undefined,
-        backgroundColor: isBox ? `${boxColor}08` : undefined,
-        borderRadius: isBox ? `${Math.max(1, 3 * scale)}px` : undefined,
+        height: `${height}px`,
+        border: `${Math.max(1.5, 2 * scale)}px solid ${boxColor}`,
+        backgroundColor: `${boxColor}0a`,
+        borderRadius: `${Math.max(1, 3 * scale)}px`,
         fontSize: `${fontSize}px`,
-        lineHeight: '1.25',
+        lineHeight: '1.3',
       }}
     >
-      <div style={{ display: 'grid', gridTemplateColumns: scaledColWidths.map((w) => `${w.toFixed(1)}px`).join(' ') }}>
-        {zone.rows.map((row, rowIdx) => {
+      <div style={{ display: 'grid', gridTemplateColumns: colWidths.map((w) => `${(w * colScale).toFixed(1)}px`).join(' ') }}>
+        {zone.rows.map((row) => {
           const isSpanning = zone.cells.some((c) => c.row_index === row.index && c.col_type === 'spanning_header')
 
-          // Row height = distance to next row's start (not text height)
-          // This produces correct line spacing matching the original
-          const nextRow = rowIdx + 1 < zone.rows.length ? zone.rows[rowIdx + 1] : null
-          const rowStartY = row.y_min_px ?? row.y_min ?? 0
-          const nextStartY = nextRow ? (nextRow.y_min_px ?? nextRow.y_min ?? 0) : rowStartY + avgRowH
-          const rowSpacing = nextStartY - rowStartY
-          const rowH = Math.max(fontSize * 1.3, rowSpacing * scale)
-
-          // Multi-line cells need more height
+          // Multi-line height
           const maxLines = Math.max(1, ...zone.cells
             .filter((c) => c.row_index === row.index)
             .map((c) => (c.text ?? '').split('\n').length))
-          const effectiveRowH = rowH * Math.max(1, maxLines)
+          const cellRowH = evenRowH * (maxLines > 1 ? maxLines * 0.7 : 1)
 
           return (
             <div key={row.index} style={{ display: 'contents' }}>
@@ -262,12 +405,14 @@ function ZoneRenderer({ zone, scale, fontSize, avgRowH }: {
                     return (
                       <div
                         key={cell.cell_id}
-                        className={`px-0.5 overflow-hidden ${row.is_header ? 'font-bold' : ''}`}
+                        className={`px-1 overflow-hidden ${row.is_header ? 'font-bold' : ''}`}
                         style={{
                           gridColumn: `${cell.col_index + 1} / ${cell.col_index + 1 + colspan}`,
-                          minHeight: `${effectiveRowH}px`,
+                          height: `${cellRowH}px`,
                           color: color || undefined,
                           whiteSpace: 'pre-wrap',
+                          display: 'flex',
+                          alignItems: 'center',
                         }}
                       >
                         {cell.text}
@@ -277,20 +422,23 @@ function ZoneRenderer({ zone, scale, fontSize, avgRowH }: {
               ) : (
                 zone.columns.map((col) => {
                   const cell = cellMap.get(`${row.index}_${col.index}`)
-                  if (!cell) return <div key={col.index} style={{ minHeight: `${rowH}px` }} />
                   const color = getCellColor(cell)
-                  const isBold = col.bold || cell.is_bold || row.is_header
-                  const text = cell.text ?? ''
+                  const isBold = col.bold || cell?.is_bold || row.is_header
+                  const text = cell?.text ?? ''
+                  const isMultiLine = text.includes('\n')
 
                   return (
                     <div
                       key={col.index}
-                      className={`px-0.5 overflow-hidden ${isBold ? 'font-bold' : ''}`}
+                      className={`px-1 overflow-hidden ${isBold ? 'font-bold' : ''}`}
                       style={{
-                        minHeight: `${rowH}px`,
+                        height: `${cellRowH}px`,
                         color: color || undefined,
-                        whiteSpace: text.includes('\n') ? 'pre-wrap' : 'nowrap',
-                        textOverflow: text.includes('\n') ? undefined : 'ellipsis',
+                        whiteSpace: isMultiLine ? 'pre-wrap' : 'nowrap',
+                        textOverflow: isMultiLine ? undefined : 'ellipsis',
+                        display: 'flex',
+                        alignItems: isMultiLine ? 'flex-start' : 'center',
+                        paddingLeft: isMultiLine ? `${fontSize * 0.5}px` : undefined,
                       }}
                     >
                       {text}
@@ -305,3 +453,30 @@ function ZoneRenderer({ zone, scale, fontSize, avgRowH }: {
     </div>
   )
 }
+
+// ---------------------------------------------------------------------------
+// Coordinate grid
+// ---------------------------------------------------------------------------
+
+function CoordinateGrid({ imgW, imgH, scale, spacing }: {
+  imgW: number; imgH: number; scale: number; spacing: number
+}) {
+  const lines: JSX.Element[] = []
+  for (let x = 0; x <= imgW; x += spacing) {
+    const px = x * scale
+    lines.push(
+      <div key={`v${x}`} className="absolute top-0 bottom-0 pointer-events-none" style={{ left: `${px}px`, width: '1px', background: 'rgba(0,150,255,0.2)' }}>
+        <span className="absolute top-0 left-1 text-[8px] text-blue-400 font-mono">{x}</span>
+      </div>
+    )
+  }
+  for (let y = 0; y <= imgH; y += spacing) {
+    const px = y * scale
+    lines.push(
+      <div key={`h${y}`} className="absolute left-0 right-0 pointer-events-none" style={{ top: `${px}px`, height: '1px', background: 'rgba(0,150,255,0.2)' }}>
+        <span className="absolute left-1 top-0.5 text-[8px] text-blue-400 font-mono">{y}</span>
+      </div>
+    )
+  }
+  return <>{lines}</>
+}