diff --git a/lib/controllers/room_chat.dart b/lib/controllers/room_chat.dart
index 2860a60..94fb7a3 100644
--- a/lib/controllers/room_chat.dart
+++ b/lib/controllers/room_chat.dart
@@ -243,17 +243,14 @@ class RoomChatController(final ChatParams info)
       ref.invalidate(provider);
     }
 
-    var taggedMessage = text;
-
-    for (final tag in tags) {
-      final escaped = RegExp.escape(tag.id);
-      final pattern = RegExp(r"@+(" + escaped + r")(#[^#]*#)?");
-
-      taggedMessage = taggedMessage.replaceAllMapped(
-        pattern,
+    // Replaces each formatted tag, like "@id#name#", with its ID
+    final taggedMessage = tags.fold(
+      text,
+      (message, tag) => message.replaceAllMapped(
+        RegExp(r"@+(" + RegExp.escape(tag.id) + r")(#[^#]*#)?"),
         (match) => match.group(1)!,
-      );
-    }
+      ),
+    );
 
     final client = ref.read(ClientController.provider.notifier);
     final event = await client.sendMessage(
diff --git a/lib/controllers/spaces.dart b/lib/controllers/spaces.dart
index 8af045c..4d6dffe 100644
--- a/lib/controllers/spaces.dart
+++ b/lib/controllers/spaces.dart
@@ -25,55 +25,50 @@ class SpacesController extends AsyncNotifier<IList<Space>> {
           MapEntry(spaceId, edges.map((edge) => edge.childId).toList()),
     );
 
-    Set<String> collectDescendants(String startId) {
-      final visited = <String>{};
-      final stack = [startId];
-
-      while (stack.isNotEmpty) {
-        final current = stack.removeLast();
-        final children = childrenById[current] ?? const [];
-
-        for (final child in children) {
-          if (visited.add(child)) {
-            stack.add(child);
-          }
-        }
-      }
-
-      return visited;
-    }
+    /// Everything under [spaceId], however deep, skipping any already
+    /// [visited] so cycles end.
+    ISet<String> collectDescendants(
+      String spaceId, [
+      ISet<String> visited = const .empty(),
+    ]) => (childrenById[spaceId] ?? const []).fold(
+      visited,
+      (visited, childId) => visited.contains(childId)
+          ? visited
+          : collectDescendants(childId, visited.add(childId)),
+    );
 
     Space buildSpace(String spaceId) {
       final space = rooms[spaceId];
       final directChildrenIds = childrenById[spaceId] ?? const [];
 
-      final directRooms = <Room>[];
-      final subSpaces = <Subspace>[];
-
-      for (final childId in directChildrenIds) {
-        final room = rooms[childId];
-        if (room == null) continue;
-
-        if (childrenById.containsKey(childId)) {
-          final descendants = collectDescendants(childId);
-
-          subSpaces.add(
-            .new(
-              room: room,
-              children: .new(descendants.map((id) => rooms[id]).nonNulls),
-            ),
-          );
-        } else {
-          directRooms.add(room);
-        }
-      }
-
       return .new(
         id: spaceId,
         room: space,
         title: space?.metadata?.name ?? "Unnamed Space",
-        children: .new(directRooms),
-        subSpaces: .new(subSpaces),
+        children: .new(
+          directChildrenIds
+              .where((childId) => !childrenById.containsKey(childId))
+              .map((childId) => rooms[childId])
+              .nonNulls,
+        ),
+        subSpaces: .new(
+          directChildrenIds
+              .where(childrenById.containsKey)
+              .map(
+                (childId) => switch (rooms[childId]) {
+                  final room? => Subspace(
+                    room: room,
+                    children: .new(
+                      collectDescendants(childId)
+                          .map((id) => rooms[id])
+                          .nonNulls,
+                    ),
+                  ),
+                  null => null,
+                },
+              )
+              .nonNulls,
+        ),
       );
     }
 
diff --git a/lib/controllers/via.dart b/lib/controllers/via.dart
index 39db682..8c7f0db 100644
--- a/lib/controllers/via.dart
+++ b/lib/controllers/via.dart
@@ -1,53 +1,48 @@
-import "package:collection/collection.dart";
 import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:nexus/controllers/client_state.dart";
 import "package:nexus/models/content/content.dart";
 import "package:nexus/models/content/membership.dart";
 import "package:nexus/models/content/power_levels.dart";
+import "package:nexus/models/event.dart";
 import "package:nexus/models/room.dart";
 
 class ViaController(final Room room) extends Notifier<String> {
   @override
   String build() {
-    final servers = <String>{};
+    final powerLevelUsers =
+        switch (room.state[EventType.powerLevels.type]?[""]) {
+          final rowId? => switch (room.events[rowId]?.content) {
+            PowerLevelsContent(:final users) => users.keys.toIList(),
+            _ => null,
+          },
+          null => null,
+        } ??
+        .new([]);
 
-    void addUserId(String? userId) {
-      final server = userId?.split(":").lastOrNull;
-      if (server != null) {
-        servers.add(server);
-      }
-    }
+    final joinedMembers =
+        (room.state[EventType.membership.type]?.values ?? const [])
+            .map(
+              (rowId) => switch (room.events[rowId]) {
+                Event(
+                  stateKey: final userId?,
+                  content: MembershipContent(status: .join),
+                ) =>
+                  userId,
+                _ => null,
+              },
+            )
+            .nonNulls
+            .toIList();
 
-    addUserId(ref.watch(ClientStateController.provider)?.userId);
-
-    final powerLevelsEventId = room.state[EventType.powerLevels.type]?[""];
-    final powerLevels = powerLevelsEventId == null
-        ? null
-        : room.events[powerLevelsEventId];
-
-    if (powerLevels?.content case PowerLevelsContent(:final users)) {
-      for (final userId in users.keys) {
-        addUserId(userId);
-        if (servers.length >= 5) break;
-      }
-    }
-
-    final members = room.state[EventType.membership.type]?.values.toIList();
-    for (var i = 0; servers.length < 5; i++) {
-      final membershipEventId = members?.getOrNull(i);
-      final member = membershipEventId == null
-          ? null
-          : room.events[membershipEventId];
-
-      if (member?.content case MembershipContent(:final status)) {
-        if (status == .join) {
-          addUserId(member?.stateKey);
-        }
-      }
-
-      if (members?.getOrNull(i) == null) break;
-    }
+    final servers = [?ref.watch(ClientStateController.provider)?.userId]
+        .toIList()
+        .addAll(powerLevelUsers)
+        .addAll(joinedMembers)
+        .map((userId) => userId.substring(userId.indexOf(":") + 1))
+        .whereNoDuplicates()
+        .take(5)
+        .toISet();
 
     return servers.isEmpty
         ? ""
diff --git a/lib/main.dart b/lib/main.dart
index 5cd2129..8915339 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -147,7 +147,7 @@ class const App({super.key}) extends StatelessWidget {
               .watch(SettingsController.provider)
               .maybeWhen(
                 data: (settings) => settings.theme,
-                orElse: () => ThemeMode.system,
+                orElse: () => .system,
               ),
           home: child,
         );
diff --git a/lib/models/emoji.dart b/lib/models/emoji.dart
deleted file mode 100644
index 75faf08..0000000
--- a/lib/models/emoji.dart
+++ /dev/null
@@ -1,25 +0,0 @@
-import "package:fast_immutable_collections/fast_immutable_collections.dart";
-import "package:freezed_annotation/freezed_annotation.dart";
-import "package:flutter/widgets.dart";
-part "emoji.freezed.dart";
-part "emoji.g.dart";
-
-@Freezed(toJson: false, fromJson: false)
-@JsonSerializable(createToJson: false)
-class Emoji({
-  @JsonKey(
-    fromJson: Emoji.widgetFromJson,
-    readValue: Emoji.readWidgetValueFromJson,
-  )
-  required final Widget widget,
-  @JsonKey(name: "emoji") required final String value,
-  required final IList<String> aliases,
-  required final String description,
-  required final IList<String> tags,
-}) with _$Emoji {
-  static Widget widgetFromJson(String emoji) => Text(emoji);
-
-  static String readWidgetValueFromJson(Map<dynamic, dynamic> json, _) =>
-      json["emoji"];
-  factory Emoji.fromJson(Map<String, Object?> json) => _$EmojiFromJson(json);
-}
diff --git a/lib/models/emoji_category.dart b/lib/models/emoji_category.dart
deleted file mode 100644
index cc39bc3..0000000
--- a/lib/models/emoji_category.dart
+++ /dev/null
@@ -1,12 +0,0 @@
-import "package:fast_immutable_collections/fast_immutable_collections.dart";
-import "package:freezed_annotation/freezed_annotation.dart";
-import "package:nexus/models/emoji.dart";
-import "package:flutter/widgets.dart";
-part "emoji_category.freezed.dart";
-
-@Freezed(toJson: false, fromJson: false)
-class EmojiCategory({
-  required final Widget icon,
-  required final String name,
-  required final IList<Emoji> emojis,
-}) with _$EmojiCategory;
diff --git a/lib/widgets/composer/composer.dart b/lib/widgets/composer/composer.dart
index 5f79960..720fa58 100644
--- a/lib/widgets/composer/composer.dart
+++ b/lib/widgets/composer/composer.dart
@@ -399,11 +399,11 @@ class const Composer(
 
                                       if (!shiftPressed) {
                                         send();
-                                        return KeyEventResult.handled;
+                                        return .handled;
                                       }
                                     }
 
-                                    return KeyEventResult.ignored;
+                                    return .ignored;
                                   },
                                   // Overrides the keyboard shortcut for pasting
                                   child: Actions(
diff --git a/lib/widgets/composer/relation_preview.dart b/lib/widgets/composer/relation_preview.dart
index fca9de6..aaf1f5c 100644
--- a/lib/widgets/composer/relation_preview.dart
+++ b/lib/widgets/composer/relation_preview.dart
@@ -38,7 +38,7 @@ class const RelationPreview(
               onPressed: toggleShouldMention,
               child: Text(
                 shouldMention ? "@On" : "@Off",
-                style: TextStyle(
+                style: .new(
                   fontWeight: .w900,
                   color: shouldMention ? null : Theme.of(context).disabledColor,
                 ),
diff --git a/lib/widgets/html/html.dart b/lib/widgets/html/html.dart
index 5ea584f..d356f6e 100644
--- a/lib/widgets/html/html.dart
+++ b/lib/widgets/html/html.dart
@@ -76,7 +76,7 @@ class const Html(
           src == null
               ? SizedBox.shrink()
               : InlineCustomWidget(
-                  alignment: PlaceholderAlignment.middle,
+                  alignment: .middle,
                   child: ExpandableImage(
                     .new(mxc: src),
                     downloadFilename: src.pathSegments.last,
diff --git a/lib/widgets/lazy_loading/message_displayname.dart b/lib/widgets/lazy_loading/message_displayname.dart
index 5d3bf19..d7c91bd 100644
--- a/lib/widgets/lazy_loading/message_displayname.dart
+++ b/lib/widgets/lazy_loading/message_displayname.dart
@@ -49,7 +49,7 @@ class const MessageDisplayname(
           final children => Row(
             spacing: 4,
             mainAxisSize: .min,
-            children: [for (final child in children) Flexible(child: child)],
+            children: children.map((child) => Flexible(child: child)).toList(),
           ),
         },
       ),
diff --git a/lib/widgets/message_image.dart b/lib/widgets/message_image.dart
index 969dcd3..70aedd9 100644
--- a/lib/widgets/message_image.dart
+++ b/lib/widgets/message_image.dart
@@ -27,7 +27,7 @@ final class const MessageImage(
           child: Image(
             image: MxcImage(ref, request),
             width: info?.width?.toDouble(),
-            fit: BoxFit.fitWidth,
+            fit: .fitWidth,
             loadingBuilder: (_, child, loadingProgress) =>
                 loadingProgress == null
                 ? child
diff --git a/lib/widgets/notifications_list.dart b/lib/widgets/notifications_list.dart
index 0b0741f..23ff676 100644
--- a/lib/widgets/notifications_list.dart
+++ b/lib/widgets/notifications_list.dart
@@ -151,7 +151,7 @@ class const NotificationsList({super.key})
                           listController: listController.value,
                           controller: scrollController,
                           itemCount: value.length,
-                          padding: const EdgeInsets.symmetric(
+                          padding: const .symmetric(
                             horizontal: 8,
                             vertical: 12,
                           ),
diff --git a/lib/widgets/room_menu_button.dart b/lib/widgets/room_menu_button.dart
index 38ad847..358c8d8 100644
--- a/lib/widgets/room_menu_button.dart
+++ b/lib/widgets/room_menu_button.dart
@@ -146,7 +146,7 @@ final class const RoomMenuButton(
             ),
             child: ListTile(
               leading: Icon(Icons.logout, color: danger),
-              title: Text("Leave", style: TextStyle(color: danger)),
+              title: Text("Leave", style: .new(color: danger)),
             ),
           ),
         ],
diff --git a/lib/widgets/settings/dialog_list_tile.dart b/lib/widgets/settings/dialog_list_tile.dart
index b31182f..f884f31 100644
--- a/lib/widgets/settings/dialog_list_tile.dart
+++ b/lib/widgets/settings/dialog_list_tile.dart
@@ -42,7 +42,7 @@ final class const DialogListTile<T>({
         child: Chip(
           label: Text(
             value is T ? getName(value as T) : "None",
-            overflow: TextOverflow.ellipsis,
+            overflow: .ellipsis,
             style: onChanged == null || saving.active
                 ? .new(color: Colors.grey)
                 : null,
diff --git a/lib/widgets/settings/radio_sheet.dart b/lib/widgets/settings/radio_sheet.dart
index 9f9512e..5572d48 100644
--- a/lib/widgets/settings/radio_sheet.dart
+++ b/lib/widgets/settings/radio_sheet.dart
@@ -36,7 +36,7 @@ final class const RadioSheet<T>({
           onChanged: (value) => chosen.value = (value as T,),
 
           child: Column(
-            mainAxisSize: MainAxisSize.min,
+            mainAxisSize: .min,
             children: options
                 .map(
                   (option) => RadioListTile<T>(
diff --git a/lib/widgets/sync_status_banner.dart b/lib/widgets/sync_status_banner.dart
index 3f1e47e..10aec7e 100644
--- a/lib/widgets/sync_status_banner.dart
+++ b/lib/widgets/sync_status_banner.dart
@@ -67,7 +67,7 @@ class const SyncStatusBanner({super.key}) extends ConsumerWidget {
                           banner.title,
                           maxLines: 1,
                           overflow: .ellipsis,
-                          style: TextStyle(
+                          style: .new(
                             color: banner.foreground,
                             fontWeight: .bold,
                           ),