fix: add min-h-0 to session list container for proper scrolling

Author: Chris Scott

frontend/src/pages/RepoDetail.tsx

@@ -91,7 +91,7 @@ export function RepoDetail() {
   const currentBranch = repo.currentBranch || "main";
 
   return (
-    <div className="min-h-screen bg-gradient-to-br from-background via-background to-background flex flex-col">
+    <div className="h-screen bg-gradient-to-br from-background via-background to-background flex flex-col">
       <div className="sticky top-0 z-10 border-b border-border bg-gradient-to-b from-background via-background to-background backdrop-blur-sm px-4 py-2">
         <div className="flex items-center justify-between">
           <div className="flex items-center gap-3">
@@ -149,7 +149,7 @@ export function RepoDetail() {
         </div>
       </div>
 
-      <div className="flex-1 overflow-hidden">
+      <div className="flex-1 overflow-hidden min-h-0">
         {opcodeUrl && repoDirectory && (
           <SessionList
             opcodeUrl={opcodeUrl}