PICK SEA: gate PRV|NXT on .fyi-open like sig + fan

stale "always visible" override in .sea-stat-block was leftover from before
the FYI panel became toggle-able. sea.js already adds/removes .fyi-open
on _openInfo/_closeInfo, so SCSS-only fix.

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/static_src/scss/_card-deck.scss

@@ -1572,9 +1572,10 @@ $_sea-title-els: '.fan-card-name, .sig-qualifier-above, .sig-qualifier-below, .f
 
     @include stat-block-shared;
 
-    // Sea's FYI panel is permanent (not hover-toggled), so its PRV/NXT nav
+    // PRV/NXT only appear once the FYI tooltip is open (matches sig + fan).
-    // buttons are always visible — overrides the mixin's hidden-by-default.
+    &.fyi-open {
         .fyi-prev, .fyi-next { display: inline-flex; }
+    }
 }
 
 @media (orientation: landscape) {