fix: portal daily chart bars collapsed to zero height

app/portal/page.tsx

@@ -432,7 +432,7 @@ export default function PortalPage() {
                     return (
                       <div
                         key={day.date}
-                        className="flex-1 min-w-[34px] flex flex-col items-center gap-1 group relative"
+                        className="flex-1 min-w-[34px] h-full flex flex-col items-center gap-1 group relative"
                       >
                         {/* Hover Tooltip */}
                         <div className="absolute -top-10 opacity-0 group-hover:opacity-100 transition-opacity pointer-events-none bg-black/90 border border-purple-700/60 rounded-lg px-2 py-1 text-[10px] font-mono text-white whitespace-nowrap z-20 shadow-lg">
@@ -440,7 +440,7 @@ export default function PortalPage() {
                         </div>
 
                         {/* Bar */}
-                        <div className="w-full bg-[#1e0e38] rounded-t-lg overflow-hidden flex flex-col justify-end" style={{ height: "100%" }}>
+                        <div className="w-full flex-1 min-h-0 bg-[#1e0e38] rounded-t-lg overflow-hidden flex flex-col justify-end">
                           <div
                             style={{ height: `${heightPercent}%` }}
                             className="w-full bg-gradient-to-t from-orange-600 to-amber-400 rounded-t-lg transition-all group-hover:brightness-125"