feat: add WebView XHR interceptor for mock train position injection

- Scrape & analyse all 19 internal APIs of train.jr-shikoku.co.jp/sp.html
  using puppeteer + Chromium remote debugging
- Save live-captured sample JSON for every API endpoint under
  lib/mockApi/mockData/ (station lists, lang, timetable, train positions, etc.)
- Add lib/mockApi/webviewXhrInterceptor.ts – generates a JS snippet that
  overrides XMLHttpRequest inside the WebView before page scripts run;
  intercepts /g?arg1=train&arg2=train (and optionally all static APIs)
  returning mock data instead of the real server response
- Add lib/mockApi/index.ts – convenience re-exports + MOCK_TRAIN_POSITIONS
  constant pre-populated with captured sample data
- Extend InjectJavascriptOptions with optional mockApiConfig field
- injectJavascriptData() prepends the interceptor JS when mockApiConfig is set
- TrainMenuContext gains mockApiEnabled / setMockApiEnabled and
  mockTrainPositions / setMockTrainPositions state; consumers can enable
  mock mode and inject custom TrainEntry[] without reloading the app

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

lib/webViewInjectjavascript.ts

@@ -2,6 +2,7 @@ import { INTERVALS, API_ENDPOINTS } from '@/constants';
 import { TRAIN_TYPE_CONFIG } from './webview/trainTypeConfig';
 import { TRAIN_ICON_MAP, TRAIN_ICON_REGEX } from './webview/trainIconMap';
 import { STATION_DATA } from './webview/stationData';
+import { generateXhrInterceptorJs, MockApiConfig } from './mockApi/webviewXhrInterceptor';
 
 export interface InjectJavascriptOptions {
   /** 地図スイッチ ("true" | "false") */
@@ -20,6 +21,12 @@ export interface InjectJavascriptOptions {
   useElesite: string;
   /** ダークモードかどうか */
   isDark: boolean;
+  /**
+   * モックAPIの設定。指定した場合、WebView内の公式サイトAPIをインターセプトして
+   * モックデータを返すXHRインターセプターが注入されます。
+   * 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;
 }
 
 export const injectJavascriptData = ({
@@ -31,7 +38,13 @@ export const injectJavascriptData = ({
   useUnyohub,
   useElesite,
   isDark,
+  mockApiConfig = null,
 }: InjectJavascriptOptions): string => {
+  // XHRインターセプターを先頭に注入（モックモード有効時）
+  const xhrInterceptor = mockApiConfig
+    ? generateXhrInterceptorJs(mockApiConfig)
+    : '';
+
   // 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 =
     mapSwitch != "true"
@@ -1392,6 +1405,7 @@ setStationMenuDialog.observe(document.querySelector('#disp'), {
 `
       : ``;
   return (
+    xhrInterceptor +
     bootData +
     topMenu +
     trainIcon +