refactor: Add more stricter lints

lib/pages/chat/command_hints.dart

@@ -26,41 +26,41 @@ String commandExample(String command) {
 
 String commandHint(L10n l10n, String command) {
   switch (command) {
-    case "ban":
+    case 'ban':
       return l10n.commandHint_ban;
-    case "clearcache":
+    case 'clearcache':
       return l10n.commandHint_clearcache;
-    case "create":
+    case 'create':
       return l10n.commandHint_create;
-    case "discardsession":
+    case 'discardsession':
       return l10n.commandHint_discardsession;
-    case "dm":
+    case 'dm':
       return l10n.commandHint_dm;
-    case "html":
+    case 'html':
       return l10n.commandHint_html;
-    case "invite":
+    case 'invite':
       return l10n.commandHint_invite;
-    case "join":
+    case 'join':
       return l10n.commandHint_join;
-    case "kick":
+    case 'kick':
       return l10n.commandHint_kick;
-    case "leave":
+    case 'leave':
       return l10n.commandHint_leave;
-    case "me":
+    case 'me':
       return l10n.commandHint_me;
-    case "myroomavatar":
+    case 'myroomavatar':
       return l10n.commandHint_myroomavatar;
-    case "myroomnick":
+    case 'myroomnick':
       return l10n.commandHint_myroomnick;
-    case "op":
+    case 'op':
       return l10n.commandHint_op;
-    case "plain":
+    case 'plain':
       return l10n.commandHint_plain;
-    case "react":
+    case 'react':
       return l10n.commandHint_react;
-    case "send":
+    case 'send':
       return l10n.commandHint_send;
-    case "unban":
+    case 'unban':
       return l10n.commandHint_unban;
     case 'markasdm':
       return l10n.commandHint_markasdm;
@@ -85,6 +85,6 @@ String commandHint(L10n l10n, String command) {
     case 'logoutall':
       return l10n.commandHint_logoutall;
     default:
-      return "";
+      return '';
   }
 }

lib/pages/chat/events/html_message.dart

@@ -253,9 +253,8 @@ class HtmlMessage extends StatelessWidget {
             : checkboxCheckedEvents?.firstWhereOrNull(
                 (event) => event.checkedCheckboxId == checkboxIndex,
               );
-        final staticallyChecked = !isCheckbox
-            ? false
-            : node.children.first.attributes['checked'] == 'true';
+        final staticallyChecked =
+            isCheckbox && node.children.first.attributes['checked'] == 'true';
 
         return WidgetSpan(
           child: Padding(

lib/pages/chat_list/chat_list_item.dart

@@ -56,9 +56,9 @@ class ChatListItem extends StatelessWidget {
       return const SizedBox.shrink();
     }
 
-    final needLastEventSender = lastEvent == null
-        ? false
-        : room.getState(EventTypes.RoomMember, lastEvent.senderId) == null;
+    final needLastEventSender =
+        lastEvent != null &&
+        room.getState(EventTypes.RoomMember, lastEvent.senderId) == null;
     final space = this.space;
 
     return Padding(

lib/pages/chat_search/chat_search_files_tab.dart

@@ -55,9 +55,9 @@ class ChatSearchFilesTab extends StatelessWidget {
                     'UNKNOWN');
           final sizeString = event.sizeString;
           final prevEvent = i > 0 ? events[i - 1] : null;
-          final sameEnvironment = prevEvent == null
-              ? false
-              : prevEvent.originServerTs.sameEnvironment(event.originServerTs);
+          final sameEnvironment =
+              prevEvent != null &&
+              prevEvent.originServerTs.sameEnvironment(event.originServerTs);
           return Padding(
             padding: const EdgeInsets.all(8.0),
             child: Column(

lib/pages/login/login.dart

@@ -207,7 +207,7 @@ class LoginController extends State<Login> {
     final data = <String, dynamic>{
       'new_password': password,
       'logout_devices': false,
-      "auth": AuthenticationThreePidCreds(
+      'auth': AuthenticationThreePidCreds(
         type: AuthenticationTypes.emailIdentity,
         threepidCreds: ThreepidCreds(
           sid: response.result!.sid,

lib/pages/settings_emotes/settings_emotes.dart

@@ -234,9 +234,9 @@ class EmotesSettingsController extends State<EmotesSettings> {
               ?.tryGetMap<String, Object?>(stateKey ?? '') !=
           null;
 
-  bool get readonly => room == null
-      ? false
-      : room?.canChangeStateEvent('im.ponies.room_emotes') == false;
+  bool get readonly =>
+      room != null &&
+      room?.canChangeStateEvent('im.ponies.room_emotes') == false;
 
   void resetAction() {
     setState(() {

lib/pages/settings_notifications/push_rule_extensions.dart

@@ -117,6 +117,6 @@ extension PushRuleKindLocal on PushRuleKind {
 
 extension on String {
   String capitalize() {
-    return "${this[0].toUpperCase()}${substring(1).toLowerCase()}";
+    return '${this[0].toUpperCase()}${substring(1).toLowerCase()}';
   }
 }

lib/pages/sign_in/view_model/flows/sso_login.dart

@@ -32,7 +32,7 @@ Future<void> ssoLoginFlow(
   final urlScheme =
       (PlatformInfos.isMobile || PlatformInfos.isWeb || PlatformInfos.isMacOS)
       ? Uri.parse(redirectUrl).scheme
-      : "http://localhost:3001";
+      : 'http://localhost:3001';
   final result = await FlutterWebAuth2.authenticate(
     url: url.toString(),
     callbackUrlScheme: urlScheme,