Adapt table implementation from crossink

lib/Md/MdParser.h

@@ -23,7 +23,10 @@ enum class BlockType : uint8_t {
   Blockquote,
   CodeBlock,
   HorizontalRule,
-  BlankLine
+  BlankLine,
+  TableHeader,     // | col | col | — header row
+  TableSeparator,  // | --- | --- | — ignored visually
+  TableRow,        // | val | val | — data row
 };
 
 struct ParsedLine {
@@ -31,8 +34,15 @@ struct ParsedLine {
   std::vector<Span> spans;
   std::string listPrefix;   // "• " or "1. " etc.
   uint8_t indentLevel = 0;  // Nesting depth (each 4 spaces = 1 level)
+  // For TableHeader / TableRow: one entry per cell (already inline-parsed)
+  std::vector<std::vector<Span>> tableCells;
 };
 
+// Returns true if the line is a GFM pipe-table row (| ... |) or separator (| --- |).
+bool isTableRow(const std::string& line);
+// Returns true if the line is a GFM table separator row (| :---: | --- |).
+bool isTableSeparator(const std::string& line);
+
 // Parse a single raw line of markdown into block type and styled spans.
 // |inCodeBlock| indicates whether the line is inside a fenced code block.
 ParsedLine parseLine(const std::string& rawLine, bool inCodeBlock);