refactor: deduplicate edge type name/color mappings via EdgeTypeRegistry

Gvisual/src/gvisual/AdjacencyMatrixHeatmap.java

@@ -206,14 +206,7 @@ public String getToolTipText(MouseEvent e) {
 
     private String getEdgeTypeName(String type) {
         if (type == null) return "unknown";
-        switch (type) {
-            case "f": return "Friend";
-            case "c": return "Classmate";
-            case "fs": return "Familiar Stranger";
-            case "s": return "Stranger";
-            case "sg": return "Study Group";
-            default: return type;
-        }
+        return EdgeTypeRegistry.getName(type);
     }
 
     private Color getEdgeColor(Edge e) {

Gvisual/src/gvisual/InteractiveHtmlExporter.java

@@ -401,28 +401,15 @@ private String generateJs() {
 
     /** Maps Edge type codes to human-readable names. */
     private static String typeName(String type) {
-        if (type == null) return "Unknown";
-        switch (type) {
-            case "f":  return "Friend";
-            case "fs": return "Facebook";
-            case "c":  return "Classmate";
-            case "s":  return "Stranger";
-            case "sg": return "Study Group";
-            default:   return type;
-        }
+        return EdgeTypeRegistry.getName(type);
     }
 
     /** Maps Edge type codes to CSS colors. */
     private static String typeColor(String type) {
         if (type == null) return "#999";
-        switch (type) {
-            case "f":  return "#4CAF50";
-            case "fs": return "#2196F3";
-            case "c":  return "#FF9800";
-            case "s":  return "#9E9E9E";
-            case "sg": return "#9C27B0";
-            default:   return "#607D8B";
-        }
+        String hex = EdgeTypeRegistry.getHexColor(type);
+        // EdgeTypeRegistry returns "#CCCCCC" for unknowns; remap to our default
+        return "#CCCCCC".equals(hex) ? "#607D8B" : hex;
     }
 
     /**

Gvisual/src/gvisual/NetworkReportGenerator.java

@@ -111,8 +111,13 @@ public int compare(Map.Entry<String, Integer> a, Map.Entry<String, Integer> b) {
             friendEdges.size(), fsEdges.size(), classmateEdges.size(),
             strangerEdges.size(), studyGEdges.size()
         };
-        String[] edgeTypeNames = {"Friend", "Familiar Stranger", "Classmate", "Stranger", "Study Group"};
-        String[] edgeTypeColors = {"#4CAF50", "#2196F3", "#FF9800", "#F44336", "#9C27B0"};
+        java.util.List<String> typeCodes = EdgeTypeRegistry.getAllTypeCodes();
+        String[] edgeTypeNames = new String[typeCodes.size()];
+        String[] edgeTypeColors = new String[typeCodes.size()];
+        for (int i = 0; i < typeCodes.size(); i++) {
+            edgeTypeNames[i] = EdgeTypeRegistry.getName(typeCodes.get(i));
+            edgeTypeColors[i] = EdgeTypeRegistry.getHexColor(typeCodes.get(i));
+        }
         int totalEdgeTypes = 0;
         for (int c : edgeTypeCounts) totalEdgeTypes += c;
 

Gvisual/src/gvisual/SvgExporter.java

@@ -56,22 +56,14 @@ public class SvgExporter {
     private boolean colorByEdgeType = true;
     private int layoutIterations = 300;
 
-    private static final Map<String, String> TYPE_COLORS = new LinkedHashMap<>();
-    static {
-        TYPE_COLORS.put("f",  "#4CAF50"); // Friend — green
-        TYPE_COLORS.put("fs", "#2196F3"); // Familiar Stranger — blue
-        TYPE_COLORS.put("c",  "#FF9800"); // Classmate — orange
-        TYPE_COLORS.put("s",  "#F44336"); // Stranger — red
-        TYPE_COLORS.put("sg", "#9C27B0"); // Study Group — purple
-    }
+    private static final Map<String, String> TYPE_COLORS = EdgeTypeRegistry.getAllHexColors();
 
-    private static final Map<String, String> TYPE_NAMES = new LinkedHashMap<>();
+    private static final Map<String, String> TYPE_NAMES;
     static {
-        TYPE_NAMES.put("f",  "Friend");
-        TYPE_NAMES.put("fs", "Familiar Stranger");
-        TYPE_NAMES.put("c",  "Classmate");
-        TYPE_NAMES.put("s",  "Stranger");
-        TYPE_NAMES.put("sg", "Study Group");
+        TYPE_NAMES = new LinkedHashMap<>();
+        for (String code : EdgeTypeRegistry.getAllTypeCodes()) {
+            TYPE_NAMES.put(code, EdgeTypeRegistry.getName(code));
+        }
     }
 
     private final Map<String, String> customColors = new LinkedHashMap<>();