Fix tag directory sorting and follow Client-Integrity.

Paginate tag (and ASC) lists via GQL with integrity retry; mint follow
integrity from a WebView because Dio /integrity tokens are bad_bot.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/widgets/integrity_webview_dialog.dart

@@ -0,0 +1,232 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:frosty/apis/twitch_integrity.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+
+/// Captures a browser-valid `Client-Integrity` header by loading Twitch in a
+/// WebView (Dio `/integrity` tokens are almost always `is_bad_bot`).
+///
+/// Returns credentials, or null if the user cancels / capture times out.
+Future<GqlIntegrityCredentials?> showIntegrityWebViewDialog({
+  required BuildContext context,
+  required String gqlToken,
+}) {
+  return showDialog<GqlIntegrityCredentials>(
+    context: context,
+    barrierDismissible: false,
+    builder: (dialogContext) => IntegrityWebViewDialog(gqlToken: gqlToken),
+  );
+}
+
+class IntegrityWebViewDialog extends StatefulWidget {
+  final String gqlToken;
+
+  const IntegrityWebViewDialog({super.key, required this.gqlToken});
+
+  @override
+  State<IntegrityWebViewDialog> createState() => _IntegrityWebViewDialogState();
+}
+
+class _IntegrityWebViewDialogState extends State<IntegrityWebViewDialog> {
+  static const _captureTimeout = Duration(seconds: 45);
+
+  late final WebViewController _controller;
+  Timer? _timeout;
+  var _captured = false;
+  var _status = 'Verifying with Twitch…';
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = WebViewController()
+      ..setJavaScriptMode(JavaScriptMode.unrestricted)
+      ..setUserAgent(
+        Platform.isIOS
+            ? 'Mozilla/5.0 (iPhone; CPU iPhone OS 18_6 like Mac OS X) '
+                'AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 '
+                'Mobile/15E148 Safari/604.1'
+            : 'Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 '
+                '(KHTML, like Gecko) Chrome/135.0.0.0 Mobile Safari/537.36',
+      )
+      ..addJavaScriptChannel(
+        'FrostyIntegrity',
+        onMessageReceived: _onIntegrityMessage,
+      )
+      ..setNavigationDelegate(
+        NavigationDelegate(
+          onPageStarted: (_) => _injectHooks(),
+          onPageFinished: (_) => _injectHooks(),
+        ),
+      );
+
+    _prepareAndLoad();
+    _timeout = Timer(_captureTimeout, () {
+      if (!mounted || _captured) return;
+      setState(() => _status = 'Timed out waiting for Twitch. Try again.');
+    });
+  }
+
+  Future<void> _prepareAndLoad() async {
+    try {
+      final cookies = WebViewCookieManager();
+      await cookies.setCookie(
+        WebViewCookie(
+          name: 'auth-token',
+          value: widget.gqlToken,
+          domain: '.twitch.tv',
+        ),
+      );
+    } catch (e) {
+      debugPrint('IntegrityWebView: cookie set failed: $e');
+    }
+
+    // Same entry as Xtra: with auth-token set, Twitch redirects and emits GQL
+    // requests that carry a browser-valid Client-Integrity header.
+    await _controller.loadRequest(Uri.parse('https://www.twitch.tv/login'));
+  }
+
+  Future<void> _injectHooks() async {
+    // Hook fetch + XHR so we see Client-Integrity on Twitch's own GQL traffic.
+    const script = r'''
+(function () {
+  if (window.__frostyIntegrityHooked) return;
+  window.__frostyIntegrityHooked = true;
+
+  function report(headers) {
+    if (!headers || !window.FrostyIntegrity) return;
+    var integrity = headers['Client-Integrity'] || headers['client-integrity'];
+    if (!integrity) return;
+    var deviceId = headers['X-Device-Id'] || headers['x-device-id'] || '';
+    var clientId = headers['Client-ID'] || headers['Client-Id'] || headers['client-id'] || '';
+    window.FrostyIntegrity.postMessage(JSON.stringify({
+      integrity: integrity,
+      deviceId: deviceId,
+      clientId: clientId
+    }));
+  }
+
+  function headersToObject(headers) {
+    var out = {};
+    if (!headers) return out;
+    if (typeof Headers !== 'undefined' && headers instanceof Headers) {
+      headers.forEach(function (value, key) { out[key] = value; });
+      return out;
+    }
+    if (typeof headers === 'object') {
+      Object.keys(headers).forEach(function (key) { out[key] = headers[key]; });
+    }
+    return out;
+  }
+
+  var originalFetch = window.fetch;
+  window.fetch = function (input, init) {
+    try {
+      report(headersToObject(init && init.headers));
+    } catch (e) {}
+    return originalFetch.apply(this, arguments);
+  };
+
+  var originalOpen = XMLHttpRequest.prototype.open;
+  var originalSetHeader = XMLHttpRequest.prototype.setRequestHeader;
+  var originalSend = XMLHttpRequest.prototype.send;
+  XMLHttpRequest.prototype.open = function () {
+    this.__frostyHeaders = {};
+    return originalOpen.apply(this, arguments);
+  };
+  XMLHttpRequest.prototype.setRequestHeader = function (key, value) {
+    try { this.__frostyHeaders[key] = value; } catch (e) {}
+    return originalSetHeader.apply(this, arguments);
+  };
+  XMLHttpRequest.prototype.send = function () {
+    try { report(this.__frostyHeaders || {}); } catch (e) {}
+    return originalSend.apply(this, arguments);
+  };
+})();
+''';
+
+    try {
+      await _controller.runJavaScript(script);
+    } catch (e) {
+      debugPrint('IntegrityWebView: hook inject failed: $e');
+    }
+  }
+
+  void _onIntegrityMessage(JavaScriptMessage message) {
+    if (_captured || !mounted) return;
+
+    try {
+      final map = jsonDecode(message.message) as Map<String, dynamic>;
+      final integrity = map['integrity'] as String?;
+      if (integrity == null || integrity.isEmpty) return;
+      if (TwitchIntegrity.isBadBot(integrity)) {
+        debugPrint('IntegrityWebView: ignoring bad_bot token');
+        return;
+      }
+
+      final fromHeader = map['deviceId'] as String?;
+      final fromToken = TwitchIntegrity.deviceId(integrity);
+      final deviceId = (fromHeader != null && fromHeader.isNotEmpty)
+          ? fromHeader
+          : (fromToken ?? '');
+      if (deviceId.isEmpty) {
+        debugPrint('IntegrityWebView: missing device id');
+        return;
+      }
+
+      final expiration = TwitchIntegrity.expirationMs(integrity) ??
+          DateTime.now().millisecondsSinceEpoch + const Duration(hours: 16).inMilliseconds;
+
+      _captured = true;
+      _timeout?.cancel();
+      Navigator.of(context).pop(
+        GqlIntegrityCredentials(
+          integrityToken: integrity,
+          deviceId: deviceId,
+          expirationMs: expiration,
+        ),
+      );
+    } catch (e) {
+      debugPrint('IntegrityWebView: parse failed: $e');
+    }
+  }
+
+  @override
+  void dispose() {
+    _timeout?.cancel();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final height = MediaQuery.sizeOf(context).height * 0.55;
+    return AlertDialog(
+      title: const Text('Confirm with Twitch'),
+      content: SizedBox(
+        width: double.maxFinite,
+        height: height.clamp(280.0, 520.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            Text(_status),
+            const SizedBox(height: 12),
+            Expanded(
+              child: ClipRRect(
+                borderRadius: BorderRadius.circular(8),
+                child: WebViewWidget(controller: _controller),
+              ),
+            ),
+          ],
+        ),
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: const Text('Cancel'),
+        ),
+      ],
+    );
+  }
+}