Better support node detection

[webdevred]

Implement type-aware support vertex connection tracking described in #69

• Updated vertexConns to compute connection counts per VertexTreeType.
• Changed VertexConnMap to Map VertexTreeType (Map Text Int) for per-type tracking of vertex connections.
• Support vertex detection now operates within each vertex tree:
  • Counts direct connections for each vertex within its tree.
  • Identifies the most connected vertex in each tree.
  • Classifies it as a support node if its connection count exceeds
    80% of that tree’s total vertex count.

This improves accuracy by detecting support vertices relative to their structural group instead of across the entire mesh.

[webdevred]

• Support vertex detection

  • Updated vertexConns to compute connection counts per VertexTreeType.
  • Changed VertexConnMap to Map Text (VertexTreeType, Int) for per-type tracking of vertex connections.
  • For each vertex tree:
    • Count total vertices and all internal beam connections.
    • Identify the most connected vertex in that tree.
    • Classify it as a support node if its connection count exceeds 80% of the total number of vertices in that tree (configurable via support-threshold).
  • Added max-support-coordinates (default: 3) to limit the number of top connected vertices considered per tree.

• Configuration & parsing

  • Updated examples/jbeam-edit.yaml:
    • Raised support-threshold from 80 -> 96.
    • Added new max-support-coordinates parameter.
    • Replaced flat x-breakpoints with structured x-group-breakpoints entries using breakpoint and vertex-type.
  • In Config.hs:
    • Introduced new Operator type (OpLT, OpGT, OpLE, OpGE) and refactored breakpoint handling.
    • Added applyOperator helper to evaluate operator-based conditions.
    • Improved YAML parsing, error reporting, and default handling.

• Transformation pipeline

  • Reworked moveVerticesInVertexForest:
    • Integrates vertexConns to dynamically compute support connections.
    • Extracts support vertices using moveSupportVertices and builds SupportTree.
  • Added updateSupportVertexName to rename support vertices ending in l/m/r according to their tree type.
  • Simplified buildTreeForType and addPrefixComments for clarity and correctness, given the new support vertex handling code.

• Types

  • VertexConnMap now includes both tree type and connection count for each vertex.

• Overall effect

  • Support vertex classification is now data-driven and per-tree.
  • Naming and prefixing of support nodes are consistent across all transformations.
  • Configuration is more flexible and readable with explicit operators and thresholds.