add profile editor

Fixes #12

lib/controllers/client.dart

@@ -307,6 +307,15 @@ class ClientController extends AsyncNotifier<int> {
     }
   }
 
+  Future<void> setProfileField(String field, Object? value) => _sendCommand(
+    "set_profile_field",
+    {
+      "field": field,
+      // gomuks deletes the field when the value is omitted, not when it's null
+      "value": ?value,
+    },
+  );
+
   Future<void> reportEvent(ReportRequest request) =>
       _sendCommand("report_event", request.toJson());
 

lib/controllers/profile.dart

@@ -10,6 +10,15 @@ class ProfileController(final String userId)
     return client.getProfile(userId);
   }
 
+  Future<void> setField(String field, Object? value) async {
+    await ref
+        .read(ClientController.provider.notifier)
+        .setProfileField(field, value);
+    if (!ref.mounted) return;
+    ref.invalidateSelf();
+    await future;
+  }
+
   static final provider = AsyncNotifierProvider.family
       .autoDispose<ProfileController, ProfileResponse, String>(
         ProfileController.new,

lib/controllers/settings_sections.dart

@@ -18,12 +18,14 @@ import "package:nexus/controllers/unified_push_allowed.dart";
 import "package:nexus/controllers/unified_push_distributors.dart";
 import "package:nexus/helpers/extensions/distributor_name.dart";
 import "package:nexus/models/account_data.dart";
+import "package:nexus/models/client_state.dart";
 import "package:nexus/models/room_order.dart";
 import "package:nexus/models/settings.dart";
 import "package:nexus/models/settings_category.dart";
 import "package:nexus/models/show_and_send.dart";
 import "package:nexus/main.dart";
 import "package:nexus/widgets/settings/dialog_list_tile.dart";
+import "package:nexus/widgets/user_bottom_sheet.dart";
 import "package:nexus/widgets/reset_encryption_sheet.dart";
 import "package:nexus/helpers/extensions/show_adaptive_sheet.dart";
 
@@ -240,9 +242,28 @@ class SettingsSectionsController
           ]),
         ),
       ]),
-      if (ref.watch(ClientStateController.provider)?.isLoggedIn == true)
+      if (ref.watch(ClientStateController.provider) case ClientState(
+        isLoggedIn: true,
+        :final userId?,
+      ))
         "Account": .new([
-          .new(title: "Profile", icon: Icons.person, settings: .new([])),
+          .new(
+            title: "Profile",
+            icon: Icons.person,
+            settings: .new([
+              .new(
+                title: "Profile",
+                description: "Your avatar, display name, pronouns, and timezone, as others see them.",
+                icon: Icons.person,
+                builder: (title, description, icon) => Center(
+                  child: ConstrainedBox(
+                    constraints: .new(maxWidth: 500),
+                    child: UserBottomSheet(userId, editable: true),
+                  ),
+                ),
+              ),
+            ]),
+          ),
           .new(
             title: "Notifications",
             icon: Icons.notifications,

lib/controllers/timezones.dart

@@ -0,0 +1,17 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:timezone/data/latest_10y.dart";
+import "package:timezone/timezone.dart";
+
+/// The names of all IANA timezones, e.g. `Europe/London`, alphabetically.
+class TimezonesController extends Notifier<IList<String>> {
+  @override
+  IList<String> build() {
+    initializeTimeZones();
+    return timeZoneDatabase.locations.keys.toIList().sort();
+  }
+
+  static final provider = NotifierProvider<TimezonesController, IList<String>>(
+    TimezonesController.new,
+  );
+}