test(e2e): mobile 视口测试 (375x812) + 扩展登录态路由

完整测试覆盖 (49 路由, 0 崩溃):
- 公开 desktop: 18/18 ✓
- 登录态 desktop: 17/17 ✓ (含 orderdetail/paynow/view-ticket/ocr-scan/renew-*)
- mobile 视口: 14/14 ✓ (仅 /me 4px RenderFlex 溢出, 无害布局警告)

修复汇总 (本轮自动化发现+修复):
1. download Scrollbar 缺 ScrollPosition -> primary:true
2. contact-stores initState dispose 后 setState -> mounted 保护
3. buy-service onGenerateRoute pathElements 越界 RangeError -> 长度检查
4. add_remove_button/shopping_cart_* cartInfo 误加 ! (nullfix 脚本)
5. checkout table_token(tableNumber!) 无判空

tools/e2e/diag_me_mobile.js

@@ -0,0 +1,21 @@
+const { chromium } = require('playwright');
+(async () => {
+  const browser = await chromium.launch({ headless: true });
+  const ctx = await browser.newContext({ viewport: { width: 375, height: 812 } });
+  await ctx.addInitScript(([u,p]) => { localStorage['_test_token'] = u+'|'+p; }, ['6477108200','8818']);
+  const page = await ctx.newPage();
+  const logs = [];
+  page.on('console', m => logs.push(m.text()));
+  await page.goto('http://127.0.0.1:8099/', { waitUntil: 'load' });
+  await page.waitForSelector('canvas', { timeout: 90000 });
+  await page.reload({ waitUntil: 'load' });
+  await page.waitForTimeout(8000);
+  await page.goto('http://127.0.0.1:8099/me', { waitUntil: 'load' });
+  await page.waitForTimeout(6000);
+  const stacks = logs.filter(l => l.startsWith('CK_STACK:'));
+  for (const s of stacks) {
+    const proj = s.match(/flutter_wisetronic\/[^\s]+:\d+/g);
+    if (proj) console.log('RenderFlex 项目位置:', [...new Set(proj)].slice(0,3));
+  }
+  await browser.close();
+})();