fix: box-drawing table multi-line cell merge

Continuation rows (≤1 non-empty cell, e.g. wrapped cell text)
were being treated as separate data rows, shifting columns.
Now merged into the previous row by appending to the same cell.

src/Web/wwwroot/js/docs.js

@@ -372,23 +372,38 @@ function docsBoxBlockToGfm(buf) {
   if (seps.length < 2) return '```\n' + buf.join('\n') + '\n```';
 
   var numCols = seps.length - 1;
-  var dataRows = [];
+
+  // raw data rows 추출 후 각 셀 trim + 여분 줄(≤1개 셀만 내용있음)을 윗줄에 병합
+  var raw = [];
   for (var i = 0; i < buf.length; i++) {
-    if (/^[ \t]*│/.test(buf[i])) dataRows.push(buf[i]);
+    if (!/^[ \t]*│/.test(buf[i])) continue;
+    var cells = [];
+    for (var c = 0; c < numCols; c++) cells.push(buf[i].substring(seps[c] + 1, seps[c + 1]).trim());
+    raw.push(cells);
+  }
+  if (raw.length === 0) return '```\n' + buf.join('\n') + '\n```';
+
+  var merged = [raw[0]];
+  for (var r = 1; r < raw.length; r++) {
+    var nonEmpty = 0, lastNec = -1;
+    for (var c = 0; c < numCols; c++) { if (raw[r][c] !== '') { nonEmpty++; lastNec = c; } }
+    if (nonEmpty <= 1) {
+      // 여분 줄: 윗줄의 같은 칸에 이어붙임
+      if (lastNec >= 0 && merged[merged.length - 1][lastNec] !== '')
+        merged[merged.length - 1][lastNec] += ' ' + raw[r][lastNec];
+    } else {
+      merged.push(raw[r]);
+    }
   }
-  if (dataRows.length === 0) return '```\n' + buf.join('\n') + '\n```';
 
   var result = [];
   // header
-  var hdr = [];
-  for (var c = 0; c < numCols; c++) hdr.push(dataRows[0].substring(seps[c] + 1, seps[c + 1]).trim());
+  var hdr = merged[0];
   result.push('| ' + hdr.join(' | ') + ' |');
   result.push('|' + ' --- |'.repeat(numCols));
   // data
-  for (var r = 1; r < dataRows.length; r++) {
-    var row = [];
-    for (var c = 0; c < numCols; c++) row.push(dataRows[r].substring(seps[c] + 1, seps[c + 1]).trim());
-    result.push('| ' + row.join(' | ') + ' |');
+  for (var r = 1; r < merged.length; r++) {
+    result.push('| ' + merged[r].join(' | ') + ' |');
   }
   return result.join('\n');
 }