fix: vaccination edge count double-counting + Main.java compile error

Bug 1 — findVaccinationTargets() double-counted shared edges:

The old implementation summed the degrees of all vaccination targets
to compute totalEdgesBlocked. When two adjacent targets shared an
edge, that edge was counted twice — causing edgesBlocked to exceed
the actual number of edges and coverageRatio to exceed 100%.

Example: Star graph A-B, A-C, A-D, A-E (4 edges).
Vaccinating {A (deg=4), B (deg=1)}: old code reported 5 edges
blocked out of 4 total (125% coverage).

Fix: Count distinct edges where at least one endpoint is a target.
Uses graph.getEndpoints() for robustness. Now correctly reports 4/4
(100% coverage) for the same scenario.

Bug 2 — Main.java extra closing brace from refactor commit:

The CategoryRow refactor (45e03d8) left an extra closing brace after
initializeCategoryPanel(), causing all subsequent methods
(initializeToolBar, copyfile, main) to fall outside the class body.
This broke compilation entirely (14 'class, interface, or enum
expected' errors).

Author: sauravbhattacharya001

Gvisual/src/gvisual/InfluenceSpreadSimulator.java

@@ -357,10 +357,28 @@ public VaccinationStrategy findVaccinationTargets(int k) {
         degrees.sort((a, b) -> Integer.compare(b.getValue(), a.getValue()));
 
         List<String> targets = new ArrayList<>();
-        int totalEdgesBlocked = 0;
+        Set<String> targetSet = new HashSet<>();
         for (int i = 0; i < Math.min(k, degrees.size()); i++) {
             targets.add(degrees.get(i).getKey());
-            totalEdgesBlocked += degrees.get(i).getValue();
+            targetSet.add(degrees.get(i).getKey());
+        }
+
+        // Count distinct edges blocked: an edge is blocked if at least one
+        // of its endpoints is a vaccination target. Counting by degree
+        // double-counts edges where both endpoints are vaccinated.
+        int totalEdgesBlocked = 0;
+        for (edge e : graph.getEdges()) {
+            Collection<String> endpoints = graph.getEndpoints(e);
+            boolean blocked = false;
+            for (String ep : endpoints) {
+                if (targetSet.contains(ep)) {
+                    blocked = true;
+                    break;
+                }
+            }
+            if (blocked) {
+                totalEdgesBlocked++;
+            }
         }
 
         int totalEdges = graph.getEdgeCount();

Gvisual/src/gvisual/Main.java

@@ -2308,7 +2308,6 @@ public final void initializeCategoryPanel() {
         sgShowParam             = categoryRows[4].settingsButton;
         sgHpanel                = categoryRows[4].headerPanel;
     }
-    }
 
     /**
      * initialize the toolbar