feat: update app typography to Crimson Pro, Atkinson Hyperlegible, and Fira Code

* add credits to README

README.md

···
 - [Bluesky API Documentation](https://docs.bsky.app/)
 - [AT Protocol Specification](https://atproto.com/)
 - [Flutter Documentation](https://flutter.dev/docs)
+
+## Credits
+
+Typography inspiration from [Anisota](https://anisota.net/) by [Dame.is](https://dame.is) ([@dame.is](https://bsky.app/profile/dame.is)).
+
+[Witchsky](https://witchsky.app/) ([code](https://tangled.org/jollywhoppers.com/witchsky.app/))

lib/src/app/theme.dart

···
   }
 
   /// Builds the text theme with custom fonts.
-  /// - Lora for display styles
-  /// - Public Sans for body/label styles
-  /// - JetBrains Mono for code (available via bodySmall)
+  /// - Crimson Pro for display styles
+  /// - Atkinson Hyperlegible for body/label styles
+  /// - Fira Code for code (available via bodySmall)
   static TextTheme _buildTextTheme(Color color) {
-    final displayStyle = GoogleFonts.lora(color: color);
-    final bodyStyle = GoogleFonts.publicSans(color: color);
-    final monoStyle = GoogleFonts.jetBrainsMono(color: color);
+    final displayStyle = GoogleFonts.crimsonPro(color: color);
+    final bodyStyle = GoogleFonts.atkinsonHyperlegible(color: color);
+    final monoStyle = GoogleFonts.firaCode(color: color);
 
     return TextTheme(
-      // Display styles - Lora
+      // Display styles - Crimson Pro
       displayLarge: displayStyle.copyWith(
         fontSize: 57,
         fontWeight: FontWeight.w400,

test/flutter_test_config.dart

···
 import 'dart:async';
+
 import 'package:google_fonts/google_fonts.dart';
 
-// FIXME: Bundle Lora, Public Sans, and JetBrains Mono fonts as assets
+// FIXME: Bundle Crimson Pro, Atkinson Hyperlegible, and Fira Code fonts as assets
 // so we can test full theme creation. Currently AppTheme.light/dark tests
 // fail because google_fonts tries to fetch fonts over HTTP.
 // See: https://pub.dev/packages/google_fonts#bundling-fonts-when-releasing

www/index.html

···
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link
-    href="https://fonts.googleapis.com/css2?family=Lora:wght@400;500;600;700&family=Public+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap"
+    href="https://fonts.googleapis.com/css2?family=Crimson+Pro:wght@400;500;600;700&family=Atkinson+Hyperlegible:wght@300;400;500;600;700&family=Fira+Code:wght@400;500&display=swap"
     rel="stylesheet">
 
   <style>
···
       --cyan: #08BDBA;
       --purple: #BE95FF;
 
-      --font-display: 'Lora', serif;
-      --font-body: 'Public Sans', sans-serif;
-      --font-mono: 'JetBrains Mono', monospace;
+      --font-display: 'Crimson Pro', serif;
+      --font-body: 'Atkinson Hyperlegible', sans-serif;
+      --font-mono: 'Fira Code', monospace;
     }
 
     * {