fix(story): soft pill for scrolly caption — rounded edges with faded halo

border-radius: 9999px for a true pill shape.
box-shadow matching the background alpha creates the feathered edge fade
all the way around without any extra elements.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr

themes/intotheeast/css/style.css

@@ -1318,9 +1318,10 @@ body::after {
     max-width: 85%;
     overflow: hidden;
     text-overflow: ellipsis;
-    background: rgba(0,0,0,0.45);
+    background: rgba(0,0,0,0.38);
+    box-shadow: 0 0 14px 8px rgba(0,0,0,0.38);
     padding: 0.2rem 0.65rem;
-    border-radius: 2px;
+    border-radius: 9999px;
     z-index: 2;
 }
 .scrolly__steps-content { display: none; }