fix(ui): edit-mode wizard allows keeping the same local port

Previously, editing a forward and keeping its local port unchanged
failed the wizard's port-availability check: the in-config scan
found the forward's own entry and reported '✗ Port N already
assigned to <self.ID>'. Users had to pick a different port,
edit, then change back.

checkPortCmd now accepts an excludeID. The wizard passes
wizard.originalID when isEditing so the forward being edited is
ignored during the in-config conflict scan. The OS-level port
check is unchanged (still catches actual port collisions).

New regression test: TestCheckPortCmd_ExcludeID_AllowsKeepingOwnPort.

internal/ui/commands_test.go

@@ -162,7 +162,7 @@ func TestCheckPortCmd_PortAvailability(t *testing.T) {
 	require.NoError(t, err)
 
 	// Test checking a random high port that should be available
-	cmd := checkPortCmd(59999, configPath)
+	cmd := checkPortCmd(59999, configPath, "")
 	msg := cmd()
 
 	portMsg, ok := msg.(PortCheckedMsg)
@@ -192,7 +192,7 @@ func TestCheckPortCmd_ConfigConflict(t *testing.T) {
 	require.NoError(t, err)
 
 	// Test checking port that's already in config
-	cmd := checkPortCmd(8080, configPath)
+	cmd := checkPortCmd(8080, configPath, "")
 	msg := cmd()
 
 	portMsg, ok := msg.(PortCheckedMsg)
@@ -202,10 +202,46 @@ func TestCheckPortCmd_ConfigConflict(t *testing.T) {
 	assert.Contains(t, portMsg.message, "already assigned")
 }
 
+// TestCheckPortCmd_ExcludeID_AllowsKeepingOwnPort verifies that in edit mode
+// (excludeID set to the forward's own ID), the wizard does not falsely report
+// the same local port as already in use by the forward being edited.
+func TestCheckPortCmd_ExcludeID_AllowsKeepingOwnPort(t *testing.T) {
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, ".kportal.yaml")
+
+	configContent := `contexts:
+  - name: test-ctx
+    namespaces:
+      - name: default
+        forwards:
+          - resource: pod/my-app
+            port: 80
+            localPort: 8080
+`
+	err := os.WriteFile(configPath, []byte(configContent), 0600)
+	require.NoError(t, err)
+
+	// The forward's ID format is "<context>/<namespace>/<resource>:<port>".
+	excludeID := "test-ctx/default/pod/my-app:8080"
+
+	cmd := checkPortCmd(8080, configPath, excludeID)
+	msg := cmd()
+
+	portMsg, ok := msg.(PortCheckedMsg)
+	require.True(t, ok, "Expected PortCheckedMsg")
+	assert.Equal(t, 8080, portMsg.port)
+	// The config-conflict path must skip the excluded ID. The OS-level port
+	// availability check still runs, so the result depends on whether 8080 is
+	// in use by some other process — the relevant assertion is that the
+	// message does NOT mention "already assigned" (which is the config check).
+	assert.NotContains(t, portMsg.message, "already assigned",
+		"excludeID should suppress the config self-conflict, but got %q", portMsg.message)
+}
+
 // TestCheckPortCmd_InvalidConfig tests behavior with invalid config file
 func TestCheckPortCmd_InvalidConfig(t *testing.T) {
 	// Use a non-existent config path
-	cmd := checkPortCmd(59998, "/nonexistent/path/.kportal.yaml")
+	cmd := checkPortCmd(59998, "/nonexistent/path/.kportal.yaml", "")
 	msg := cmd()
 
 	portMsg, ok := msg.(PortCheckedMsg)

internal/ui/wizard_commands.go

@@ -145,8 +145,11 @@ func validateSelectorCmd(discovery *k8s.Discovery, contextName, namespace, selec
 	}
 }
 
-// checkPortCmd checks if a local port is available
-func checkPortCmd(port int, configPath string) tea.Cmd {
+// checkPortCmd checks if a local port is available.
+// excludeID, when non-empty, is the ID of a forward to ignore during the
+// in-config conflict scan. Used in edit mode so the wizard does not flag the
+// forward being edited as conflicting with itself.
+func checkPortCmd(port int, configPath, excludeID string) tea.Cmd {
 	return func() tea.Msg {
 		// First check if port is already in the configuration
 		cfg, err := config.LoadConfig(configPath)
@@ -154,12 +157,16 @@ func checkPortCmd(port int, configPath string) tea.Cmd {
 			// Check all forwards in config for this port
 			allForwards := cfg.GetAllForwards()
 			for _, fwd := range allForwards {
-				if fwd.LocalPort == port {
-					return PortCheckedMsg{
-						port:      port,
-						available: false,
-						message:   fmt.Sprintf("✗ Port %d already assigned to %s", port, fwd.ID()),
-					}
+				if fwd.LocalPort != port {
+					continue
+				}
+				if excludeID != "" && fwd.ID() == excludeID {
+					continue
+				}
+				return PortCheckedMsg{
+					port:      port,
+					available: false,
+					message:   fmt.Sprintf("✗ Port %d already assigned to %s", port, fwd.ID()),
 				}
 			}
 		}

internal/ui/wizard_handlers.go

@@ -656,7 +656,11 @@ func (m model) handleAddWizardEnter() (tea.Model, tea.Cmd) {
 			wizard.localPort = port
 			wizard.loading = true
 			wizard.error = nil
-			return m, checkPortCmd(port, m.ui.configPath)
+			excludeID := ""
+			if wizard.isEditing {
+				excludeID = wizard.originalID
+			}
+			return m, checkPortCmd(port, m.ui.configPath, excludeID)
 		}
 
 	case StepConfirmation: