Major UI overhaul

lib/theme/app_typography.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+
+@immutable
+class AppMonoText extends ThemeExtension<AppMonoText> {
+  const AppMonoText({required this.label, required this.body});
+
+  final TextStyle label;
+  final TextStyle body;
+
+  @override
+  AppMonoText copyWith({TextStyle? label, TextStyle? body}) {
+    return AppMonoText(label: label ?? this.label, body: body ?? this.body);
+  }
+
+  @override
+  AppMonoText lerp(ThemeExtension<AppMonoText>? other, double t) {
+    if (other is! AppMonoText) return this;
+    return AppMonoText(
+      label: TextStyle.lerp(label, other.label, t) ?? label,
+      body: TextStyle.lerp(body, other.body, t) ?? body,
+    );
+  }
+
+  static AppMonoText of(BuildContext context) {
+    final ext = Theme.of(context).extension<AppMonoText>();
+    return ext ?? const AppMonoText(label: TextStyle(), body: TextStyle());
+  }
+}