feat: tela de apps com logos/menu de exclusao, correcao de tema nas mini apps e sidebar de navegacao

lib/utils/miniapp_meta.dart

@@ -0,0 +1,109 @@
+// SPDX-FileCopyrightText: 2026 TatuChat
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+/// Names of the `<meta>` tags a mini app document must declare to be
+/// installable. They act as the mini app's manifest.
+const String miniAppMetaIdTag = 'mini-app-id';
+const String miniAppMetaNameTag = 'mini-app-name';
+const String miniAppMetaCategoryTag = 'mini-app-category';
+const String miniAppMetaDescriptionTag = 'mini-app-description';
+const String miniAppMetaLogoTag = 'mini-app-logo';
+const String miniAppMetaInChatTag = 'mini-app-in-chat';
+
+const List<String> miniAppMetaTags = [
+  miniAppMetaIdTag,
+  miniAppMetaNameTag,
+  miniAppMetaCategoryTag,
+  miniAppMetaDescriptionTag,
+  miniAppMetaLogoTag,
+  miniAppMetaInChatTag,
+];
+
+/// Manifest of a mini app, extracted from its `<meta>` tags.
+///
+/// [id] is mandatory and non-empty. It is used as the account data key under
+/// which the app's store and HTML source are persisted
+/// (`im.tatuchat.miniapps.data.<id>` / `im.tatuchat.miniapps.source.<id>`).
+class MiniAppMeta {
+  final String id;
+  final String name;
+  final String category;
+  final String description;
+  final String logo;
+
+  /// Whether the mini app can run inside a chat room. `false` by default.
+  final bool inChat;
+
+  const MiniAppMeta({
+    required this.id,
+    required this.name,
+    this.category = '',
+    this.description = '',
+    this.logo = '',
+    this.inChat = false,
+  });
+}
+
+/// Extracts the meta tags of an HTML document into a `name -> content` map
+/// (names normalized to lower case). Attribute order and quoting style are
+/// irrelevant.
+Map<String, String> extractMetaTags(String html) {
+  final result = <String, String>{};
+  final metaRegex = RegExp(r'<meta\b[^>]*>', caseSensitive: false);
+  final attrRegex = RegExp(
+    r"""(name|content)\s*=\s*["']([^"']*)["']""",
+    caseSensitive: false,
+  );
+  for (final match in metaRegex.allMatches(html)) {
+    final attributes = <String, String>{};
+    for (final attr in attrRegex.allMatches(match.group(0)!)) {
+      attributes[attr.group(1)!.toLowerCase()] = attr.group(2)!;
+    }
+    final name = attributes['name'];
+    final content = attributes['content'];
+    if (name != null && content != null) {
+      result[name.toLowerCase()] = content;
+    }
+  }
+  return result;
+}
+
+/// Parses the mini app manifest out of the `<meta>` tags of [html].
+///
+/// All [miniAppMetaTags] must be present (their content may be empty), except
+/// `mini-app-id` and `mini-app-name`, which must also be non-empty. Throws a
+/// [FormatException] with a human readable reason otherwise.
+MiniAppMeta parseMiniAppMeta(String html) {
+  final tags = extractMetaTags(html);
+  final missing = [
+    for (final tag in miniAppMetaTags)
+      if (!tags.containsKey(tag)) tag,
+  ];
+  if (missing.isNotEmpty) {
+    throw FormatException(
+      'This document is missing the required meta tag(s): '
+      '${missing.join(', ')}',
+    );
+  }
+  final id = tags[miniAppMetaIdTag]!.trim();
+  final name = tags[miniAppMetaNameTag]!.trim();
+  if (id.isEmpty) {
+    throw FormatException(
+      'The meta tag "$miniAppMetaIdTag" must not be empty',
+    );
+  }
+  if (name.isEmpty) {
+    throw FormatException(
+      'The meta tag "$miniAppMetaNameTag" must not be empty',
+    );
+  }
+  return MiniAppMeta(
+    id: id,
+    name: name,
+    category: tags[miniAppMetaCategoryTag]!.trim(),
+    description: tags[miniAppMetaDescriptionTag]!.trim(),
+    logo: tags[miniAppMetaLogoTag]!.trim(),
+    inChat: tags[miniAppMetaInChatTag]!.trim().toLowerCase() == 'true',
+  );
+}