fix: Tokyo UX stripped when mock is active

Two bugs caused the Tokyo UX to be stripped/broken when mock mode was ON:

1. **Double callback firing**: the interceptor's `setTimeout` called both
   `onreadystatechange.call(self)` AND `dispatchEvent(new Event('readystatechange'))`.
   Since `dispatchEvent` already fires `onXxx` property handlers via the DOM event
   model, the page's callback fired twice, causing a second DOM re-render that could
   overwrite Tokyo UX modifications. Fixed by relying on `dispatchEvent` only (with
   `ProgressEvent` for load events), with a direct-call fallback only for environments
   that lack `dispatchEvent`.

2. **No double-injection guard**: if `injectedJavaScriptBeforeContentLoaded` caused
   the interceptor to run more than once (e.g., `onPageStarted` fires multiple times
   on Android), `_origOpen` would capture the already-patched version, leading to
   unexpected behaviour. Fixed by adding `if (window.__jrsMockActive) return;` at the
   top of the interceptor IIFE.

3. **Belt-and-suspenders injection**: the interceptor is now also prepended to
   `injectedJavaScript` (Tokyo UX script) via the restored `mockApiConfig` parameter
   on `injectJavascriptData`. The `__jrsMockActive` guard ensures it's a no-op when
   `injectedJavaScriptBeforeContentLoaded` already ran it, but guarantees the
   interceptor is active on platforms where IJBCL is unreliable — before
   `MoveDisplayStation` triggers the first train-data poll via `onLoadEnd`.

Co-authored-by: Copilot <[email protected]>

lib/webViewInjectjavascript.ts

@@ -27,8 +27,15 @@ export interface InjectJavascriptOptions {
    * 未指定または null の場合、インターセプターは無効で通常通り公式APIに接続します。
    */
   mockApiConfig?: MockApiConfig | null;
+  /**
+   * バックエンドAPIのベースURL。省略時は本番URL。
+   * experimental 環境では https://jr-shikoku-backend-api-v1-beta.haruk.in を渡す。
+   */
+  backendApiBaseUrl?: string;
 }
 
+const PRODUCTION_BACKEND_BASE = 'https://jr-shikoku-backend-api-v1.haruk.in';
+
 export const injectJavascriptData = ({
   mapSwitch,
   iconSetting,
@@ -38,7 +45,9 @@ export const injectJavascriptData = ({
   useUnyohub,
   useElesite,
   isDark,
-}: Omit<InjectJavascriptOptions, 'mockApiConfig'>): string => {
+  backendApiBaseUrl,
+  mockApiConfig,
+}: InjectJavascriptOptions): string => {
 
   // 一番上のメニュー非表示　地図スイッチによって切り替え
   const topMenu =
@@ -1399,7 +1408,7 @@ setStationMenuDialog.observe(document.querySelector('#disp'), {
 });
 `
       : ``;
-  return (
+  let result =
     bootData +
     topMenu +
     trainIcon +
@@ -1407,8 +1416,21 @@ setStationMenuDialog.observe(document.querySelector('#disp'), {
     makeTrainView +
     makeTrainMenu +
     textInsert +
-    makeStationMenu
-  );
+    makeStationMenu;
+
+  if (backendApiBaseUrl && backendApiBaseUrl !== PRODUCTION_BACKEND_BASE) {
+    result = result.split(PRODUCTION_BACKEND_BASE).join(backendApiBaseUrl);
+  }
+
+  // Prepend XHR interceptor as a fallback for platforms where
+  // injectedJavaScriptBeforeContentLoaded doesn't run reliably.
+  // The __jrsMockActive guard in the interceptor prevents double-patching
+  // when IJBCL already installed it.
+  if (mockApiConfig) {
+    result = generateXhrInterceptorJs(mockApiConfig) + '\n' + result;
+  }
+
+  return result;
 };
 
 /**