fix(detail): resync reaction toggle across manga navigation

The detail page component is reused across /manga/A -> /manga/B
navigations (clicking a similar or recommendation card), so
ReactionButtons' locally-held `current` state kept the previous manga's
reaction until interacted with — a visibly wrong thumb on the new page.
Re-seed `current` from the loader-supplied prop via an effect keyed on
mangaId. Also fetch the homepage's two independent /me/* shelves
concurrently (Promise.allSettled) instead of in series.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/Cargo.lock

@@ -1558,7 +1558,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
 [[package]]
 name = "mangalord"
-version = "0.109.0"
+version = "0.109.1"
 dependencies = [
  "anyhow",
  "argon2",