fix: harden Human Gates review flow

frontend/index.html

@@ -187,7 +187,7 @@
         <button class="end-today-session" id="end-today-session" type="button" hidden>End session</button>
         <button class="find-work-action" id="find-work" type="button">Find work</button>
         <button class="new-issue" id="new-issue" type="button">New issue</button>
-        <button class="human-gates-launcher" id="open-human-gates" type="button">Human Gates <span id="human-gates-count">0</span></button>
+        <button class="human-gates-launcher" id="open-human-gates" type="button">Review next <span id="human-gates-count">0</span></button>
       </div>
       <section id="human-gates" class="human-gates" aria-labelledby="human-gates-heading" hidden>
         <div class="human-gates-header">