Honor --page as start page when combined with --all

`webhook list --all --page N` previously dropped the page param when
--all was set, causing GetAll to start at page 1 instead of page N. The
legacy client's GetWithPagination preserved the start page when paging
through all results; the migration regressed this.

Fixed by appending the page param to the path before invoking GetAll.
Added a unit test to lock in the behavior.

Author: robzolkos

internal/commands/webhook.go

@@ -57,6 +57,9 @@ var webhookListCmd = &cobra.Command{
 		switch {
 		case webhookListAll:
 			path := fmt.Sprintf("/boards/%s/webhooks.json", boardID)
+			if webhookListPage > 0 {
+				path += fmt.Sprintf("?page=%d", webhookListPage)
+			}
 			pages, err := ac.GetAll(cmd.Context(), path)
 			if err != nil {
 				return convertSDKError(err)

internal/commands/webhook_test.go

@@ -85,6 +85,31 @@ func TestWebhookList(t *testing.T) {
 			t.Errorf("expected path with page=3, got '%s'", got)
 		}
 	})
+
+	t.Run("--all honors --page as the start page", func(t *testing.T) {
+		mock := NewMockClient()
+		mock.GetWithPaginationResponse = &client.APIResponse{
+			StatusCode: 200,
+			Data:       []any{},
+		}
+
+		SetTestModeWithSDK(mock)
+		SetTestConfig("token", "account", "https://api.example.com")
+		defer resetTest()
+
+		webhookListBoard = "board-1"
+		webhookListPage = 2
+		webhookListAll = true
+		err := webhookListCmd.RunE(webhookListCmd, []string{})
+		webhookListBoard = ""
+		webhookListPage = 0
+		webhookListAll = false
+
+		assertExitCode(t, err, 0)
+		if got := mock.GetWithPaginationCalls[0].Path; got != "/boards/board-1/webhooks.json?page=2" {
+			t.Errorf("expected --all to start from --page=2, got '%s'", got)
+		}
+	})
 }
 
 func TestWebhookDeliveries(t *testing.T) {