all: apply golangci-lint 2.9.0 fixes

Fix issues found by the upgraded golangci-lint:
- wsl_v5: add required whitespace in CLI files
- staticcheck SA4006: replace new(var.Field) with &localVar
  pattern since staticcheck does not recognize Go 1.26
  new(value) as a use of the variable
- staticcheck SA5011: use t.Fatal instead of t.Error for
  nil guard checks so execution stops
- unused: remove dead ptrTo helper function

integration/helpers.go

@@ -929,8 +929,8 @@ func tagp(name string) policyv2.Alias {
 // prefixp returns a pointer to a Prefix from a CIDR string for policy v2 configurations.
 // Converts CIDR notation to policy prefix format for network range specifications.
 func prefixp(cidr string) policyv2.Alias {
-	prefix := netip.MustParsePrefix(cidr)
-	return new(policyv2.Prefix(prefix))
+	p := policyv2.Prefix(netip.MustParsePrefix(cidr))
+	return &p
 }
 
 // aliasWithPorts creates an AliasWithPorts structure from an alias and port ranges.

integration/scenario.go

@@ -1485,6 +1485,7 @@ func (s *Scenario) runMockOIDC(accessTTL time.Duration, users []mockoidc.MockUse
 		httpClient := &http.Client{}
 		ctx := context.Background()
 		req, _ := http.NewRequestWithContext(ctx, http.MethodGet, oidcConfigURL, nil)
+
 		resp, err := httpClient.Do(req)
 		if err != nil {
 			log.Printf("headscale mock OIDC tests is not ready: %s\n", err)