Redesign the Reader; add ESV

New reading surface with paper/sepia/dark themes, slim top and bottom bars,
and sheets for navigation, search, settings, audio and per-verse study tools.
Plan progress is built into the reader. Page-flip mode removed. ESV added via
the server-side proxy (ESV_API_KEY).

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/components/reader/AudioSheet.jsx

@@ -0,0 +1,37 @@
+import Sheet from './Sheet.jsx';
+import AudioPlayer from '../AudioPlayer.jsx';
+
+// Wraps the existing player. Audio is BSB-only, so licensed translations get a note.
+export default function AudioSheet({ open, onClose, translation, bookName, chapter, audio, narrator, onNarrator, onNext, nextDisabled }) {
+  return (
+    <Sheet open={open} onClose={onClose} title="Listen">
+      <AudioPlayer
+        title={`${bookName} ${chapter}`}
+        subtitle={audio.state.status === 'error'
+          ? "Couldn't load audio for this chapter/narrator."
+          : translation !== 'BSB'
+            ? `Audio is BSB only — no ${translation} audio is available, so it won't match the ${translation} text on screen.`
+            : 'Audio follows the chapter as you browse.'}
+        status={audio.state.status}
+        currentTime={audio.progress.currentTime}
+        duration={audio.progress.duration}
+        onPlay={audio.play}
+        onTogglePause={audio.togglePause}
+        onSeekBack={() => audio.seek(-10)}
+        onSeekForward={() => audio.seek(10)}
+        onSeekTo={audio.seekTo}
+        onNext={onNext}
+        nextDisabled={nextDisabled}
+        onStop={audio.stop}
+        controls={(
+          <select value={narrator} onChange={(e) => onNarrator(e.target.value)}
+            className="rounded-xl border border-[var(--r-line)] bg-[var(--r-bg)] px-2 py-1.5 text-sm text-[var(--r-text)]">
+            <option value="david">David</option>
+            <option value="hays">Hays</option>
+            <option value="souer">Souer</option>
+          </select>
+        )}
+      />
+    </Sheet>
+  );
+}