improve PCB footprint and graphic processing for handling the other

[techmannih]

Key Changes

• Centralized Layer Utility: Replaced multiple ad-hoc layer mapping functions (mapTextLayer, this.mapLayer) with a single, robust getLayerMapping utility in layer-utils.ts.
• Improved Board Outlines: Explicitly added Edge.Cuts support to the centralized mapping to ensure board outlines are correctly identified and processed in CollectGraphicsStage.
• Standardized Text Alignment: Added anchor_alignment: "center" to all pcb_silkscreen_text objects. This provides a more accurate representation of KiCad's default text positioning and improves visual quality in renders.
• Code Cleanup:
  • Removed redundant private methods and unused imports across CollectGraphicsStage.ts, process-text.ts, and process-graphics.ts.
  • Enhanced type safety by removing several as any casts in database insertion calls.
• Updated Snapshots: Visual regressions in tests were verified to be improvements in text centering and have been updated.

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[techmannih]

TODO:
handling other layers

  if (layerStr.includes("Silk")) {
    type = side === "top" ? "top_silkscreen" : "bottom_silkscreen"
  } else if (layerStr.includes("Fab")) {
    type = side === "top" ? "top_fabrication_note" : "bottom_fabrication_note"
  } else if (layerStr.includes("CrtYd") || layerStr.includes("Courtyard")) {
    type = side === "top" ? "top_courtyard" : "bottom_courtyard"
  } else if (layerStr.includes(".Cu")) {
    type = side === "top" ? "top_copper" : "bottom_copper"
  } else if (layerStr.includes("Mask")) {
    type = side === "top" ? "top_soldermask" : "bottom_soldermask"
  } else if (layerStr.includes("Edge.Cuts")) {
    type = "edge_cuts"
  }

[techmannih]

TODO:

handling the anchor_alignment for pcb_silkscreen_text

[techmannih]

Here, remove extra silkscreen path which is not silkscreen, might be fab or courtyard. as shown in the kicad snapshot.

TODO:
add support fab and coutyard layer