feat(home): add a "Recommended for you" shelf

Surface the content-based /me/recommendations feed as a horizontal shelf on
the homepage, below the Continue-reading shelf. Fetched after the catalogue
(same non-blocking pattern), shown only when signed in and the feed is
non-empty; reuses MangaCard in a fixed-width scroller. Component unit test +
e2e (signed-in shows cards, anonymous hides).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.108.0",
+  "version": "0.109.0",
   "private": true,
   "type": "module",
   "scripts": {