fix(manga): show force-resync result on mobile, not just desktop

`.resync-msg` (the admin Force-resync result) was display:none under 640px,
so mobile admins — who trigger resync from the overflow sheet — got no
success or error feedback. The element is already a sibling of `.action-row`
(not a child), so it survives the row being hidden; the only thing hiding it
was an explicit mobile rule. Drop that rule.

e2e: a mobile admin triggers Force resync from the overflow sheet and now
sees the "Metadata updated" result (written test-first against the hidden
element, then unhidden).

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

backend/Cargo.lock

@@ -1517,7 +1517,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
 [[package]]
 name = "mangalord"
-version = "0.88.0"
+version = "0.88.1"
 dependencies = [
  "anyhow",
  "argon2",

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mangalord"
-version = "0.88.0"
+version = "0.88.1"
 edition = "2021"
 default-run = "mangalord"