docs: drop the dead font registry and resync the reader UI spec with the shipped chrome

app/lib/application/internal_pages.dart

@@ -136,7 +136,6 @@ class InternalPages {
           _Option(_strings.t('settings-variant-green'), 'green'),
           _Option(_strings.t('settings-variant-mono'), 'mono'),
         ], current: _settings.variant.value),
-        // The library pages stay reachable now the sheet is gone.
         HeadingBlock(2, [MewsText(_strings.t('settings-library-heading'))]),
         ListBlock(
           ordered: false,

app/lib/presentation/app.dart

@@ -83,7 +83,7 @@ class MewsApp extends StatelessWidget {
   }
 }
 
-/// The chrome (address bar, FOB, sheet, dialogs) follows the same palette
+/// The chrome (address bar, dialogs, text selection) follows the same palette
 /// the reader selected for pages, so the whole app shares one color scheme.
 class _ThemedApp extends StatelessWidget {
   const _ThemedApp();
@@ -135,11 +135,6 @@ class _ThemedApp extends StatelessWidget {
       useMaterial3: true,
       colorScheme: scheme,
       scaffoldBackgroundColor: palette.background,
-      // The FOB follows the palette, not the M3 container defaults.
-      floatingActionButtonTheme: FloatingActionButtonThemeData(
-        backgroundColor: palette.link,
-        foregroundColor: palette.background,
-      ),
       // Selection highlights and the caret follow the palette too.
       textSelectionTheme: TextSelectionThemeData(
         cursorColor: palette.link,

app/lib/presentation/reader/reader_fonts.dart

@@ -1,15 +0,0 @@
-/// The bundled typefaces the reader can choose from (spec 8.2). Adding a font
-/// is one TTF in assets/fonts, one entry in pubspec.yaml and one entry here.
-class ReaderFont {
-  const ReaderFont(this.family, this.labelId);
-
-  /// The pubspec font family name.
-  final String family;
-
-  /// Message ID of its display name in locales/en-US/main.ftl.
-  final String labelId;
-}
-
-const readerFonts = [
-  ReaderFont('Atkinson Hyperlegible', 'settings-font-atkinson'),
-];

app/lib/presentation/reader/reader_screen.dart

@@ -13,8 +13,7 @@ import 'palettes.dart';
 import 'swipe_navigator.dart';
 
 /// The whole v1 UI: an address bar that hides on scroll, the page reader with
-/// swipe back/forward, a settings FOB that appears on scroll, and error
-/// states that never guess.
+/// swipe back/forward, and error states that never guess.
 class ReaderScreen extends StatefulWidget {
   const ReaderScreen({super.key});
 
@@ -49,8 +48,8 @@ class _ReaderScreenState extends State<ReaderScreen> {
     if (!_scroll.hasClients) return;
     final position = _scroll.position;
 
-    // The bar and FOB hide when the reader scrolls down and come back on any
-    // upward scroll; both are always visible at the top of the page.
+    // The bar hides when the reader scrolls down and comes back on any
+    // upward scroll; it is always visible at the top of the page.
     final wantVisible = position.pixels <= 0 ||
         position.userScrollDirection == ScrollDirection.forward;