Remove flutter chat (#26)

Had to squash merge manually as Forgejo was erroring

lib/widgets/emoji_picker_button.dart

@@ -0,0 +1,51 @@
+import "package:emoji_text_field/emoji_text_field.dart";
+import "package:flutter/material.dart";
+import "package:hooks_riverpod/hooks_riverpod.dart";
+import "package:nexus/controllers/emoji_controller.dart";
+
+class EmojiPickerButton extends HookConsumerWidget {
+  final TextEditingController? controller;
+  final void Function(String emoji)? onSelection;
+  final VoidCallback? onPressed;
+  final BuildContext context;
+  const EmojiPickerButton({
+    this.controller,
+    this.onPressed,
+    this.onSelection,
+    required this.context,
+    super.key,
+  });
+
+  @override
+  Widget build(_, WidgetRef ref) => IconButton(
+    onPressed: () async {
+      onPressed?.call();
+      final controller = this.controller ?? TextEditingController();
+
+      final emojis = await ref.watch(EmojiController.provider.future);
+      if (context.mounted) {
+        showModalBottomSheet(
+          context: context,
+          builder: (context) => EmojiKeyboardView(
+            config: EmojiViewConfig(
+              showRecentTab: false,
+              customCategories: emojis.$1.unlock,
+              customKeywords: emojis.$2.unlock,
+              backgroundColor: Theme.of(context).colorScheme.surfaceContainer,
+              height: 600,
+            ),
+            textController: controller
+              ..addListener(() {
+                // Without this, there will sometimes be a debugLocked is not true error sometimes
+                Future.delayed(Duration.zero, () {
+                  if (context.mounted) Navigator.of(context).pop();
+                });
+                onSelection?.call(controller.text);
+              }),
+          ),
+        );
+      }
+    },
+    icon: Icon(Icons.emoji_emotions),
+  );
+}