feat(web): unified reader with reading settings, faster lists, a11y

- New Reader (desktop + mobile): loads full content on open, prefetches
  the next article, reading progress and time, "Aa" settings (light /
  sepia / dark / auto theme, serif / sans / Atkinson Hyperlegible font,
  size, line height, measure), Space-to-next, keyboard shortcuts, focus
  management, inert background, URL-driven (?a=) so Back closes it.
- Dashboard: cursor pagination, unread/all filter, CSS grid (no masonry),
  no re-sorting under the reader, optimistic cache patches instead of
  refetch storms, "new articles" banner, error/offline states, j/k/o/m/s/v
  shortcuts and help dialog.
- Cards: keyboard-openable, lazy <img>, memoized, touch-only swipe.
- Focus mode: framer drag (drop @use-gesture), Read button, undo restores
  unread state, arrow keys.
- WebSocket: single connection, backoff, cache patching, no console logs.
- Contrast fixes (on-nature tokens), 44px targets, lang="fr", reduced
  motion, self-hosted fonts, theme applied before first paint.
- Code splitting + vendor chunk, prompt-based PWA updates, smaller
  precache, offline cache for opened articles and images, caches cleared
  on logout; upgrade react-router (CVE), drop unused deps and assets.

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

web/src/components/focus/FocusEmptyState.tsx

@@ -1,32 +1,25 @@
-import { motion } from 'framer-motion';
-
 interface FocusEmptyStateProps {
     onBack: () => void;
 }
 
 export function FocusEmptyState({ onBack }: FocusEmptyStateProps) {
     return (
-        <motion.div
-            initial={{ opacity: 0, scale: 0.96 }}
-            animate={{ opacity: 1, scale: 1 }}
-            transition={{ duration: 0.4 }}
-            className="flex flex-col items-center justify-center h-full text-center space-y-8 px-6"
-        >
+        <div className="flex-1 flex flex-col items-center justify-center text-center space-y-8 px-6 animate-rise">
             <div className="relative">
                 <div className="w-28 h-28 rounded-full bg-nature/10 flex items-center justify-center animate-bounce-slow">
-                    <span className="text-5xl">🌿</span>
+                    <span className="text-5xl" aria-hidden="true">🌿</span>
                 </div>
-                <div className="absolute -top-1 -right-1 w-9 h-9 bg-nature text-white rounded-full flex items-center justify-center font-bold border-4 border-carbon">
+                <div className="absolute -top-1 -right-1 w-9 h-9 bg-nature text-on-nature rounded-full flex items-center justify-center font-bold border-4 border-carbon" aria-hidden="true">
                     ✓
                 </div>
             </div>
 
             <div className="space-y-2">
                 <h1 className="text-4xl font-serif italic text-paper-white">C'est tout pour le moment !</h1>
-                <p className="eyebrow text-paper-muted">Vous êtes à jour sur vos lectures.</p>
+                <p className="text-paper-muted">Vous êtes à jour sur vos lectures.</p>
             </div>
 
-            <button onClick={onBack} className="btn-primary py-3 px-8">Retour au tableau de bord</button>
-        </motion.div>
+            <button onClick={onBack} className="btn-primary py-3 px-8" autoFocus>Retour au tableau de bord</button>
+        </div>
     );
 }