fix: use apiVersion to disambiguate CRDs with same kind (#504)

When multiple CRDs share the same kind but different API groups
(e.g. Traefik's Middleware under traefik.io and traefik.containo.us),
the dashboard failed to look up the correct resource. Thread apiVersion
through the resource fetch chain and use group-qualified kind
(e.g. Widget.new.example.com) for kubectl lookups.

Closes #504

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pkg/dashboard/utils/utils_test.go

@@ -108,6 +108,30 @@ func TestChartAndVersion(t *testing.T) {
 	}
 }
 
+func TestQualifiedKind(t *testing.T) {
+	tests := []struct {
+		kind       string
+		apiVersion string
+		want       string
+	}{
+		{"Widget", "new.example.com/v1alpha1", "Widget.new.example.com"},
+		{"Widget", "old.example.com/v1alpha1", "Widget.old.example.com"},
+		{"Deployment", "apps/v1", "Deployment"},
+		{"ConfigMap", "v1", "ConfigMap"},
+		{"ConfigMap", "", "ConfigMap"},
+		{"Middleware", "traefik.io/v1alpha1", "Middleware.traefik.io"},
+		{"Middleware", "traefik.containo.us/v1alpha1", "Middleware.traefik.containo.us"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.kind+"/"+tt.apiVersion, func(t *testing.T) {
+			got := QualifiedKind(tt.kind, tt.apiVersion)
+			if got != tt.want {
+				t.Errorf("QualifiedKind(%q, %q) = %q, want %q", tt.kind, tt.apiVersion, got, tt.want)
+			}
+		})
+	}
+}
+
 func TestEnvAsBool(t *testing.T) {
 	// value: "true" | "1", default: false -> expect true
 	t.Setenv("TEST", "true")