refactor: remove as= override and render data-spark at runtime

- Drop resolveBlockAs and the as= attribute; scanDoc now switches
  directly on role and warns on unknown roles instead of silently
  stripping
- md-table derives data-spark from its loaded CSV via
  parseSparkTableCsv; delete injectSparkDirectives and the second
  registry pass so pathIndex is exactly scanDoc output
- Align spark-table dice header regex with isSparkTableHeader

src/components/utils/spark-table.ts

@@ -53,7 +53,9 @@ export interface SparkTableMeta {
 // CSV parsing
 // ---------------------------------------------------------------------------
 
-const DICE_HEADER_RE = /^d\d+$/i;
+// Matches the scanner's `isSparkTableHeader` (content-registry): plain dice,
+// counts, and modifiers all count as spark-table first columns.
+const DICE_HEADER_RE = /^\d*d\d+(?:[+-]\d+)?$/i;
 
 /**
  * Parse a CSV string into a SparkTableMeta.