fix: show selected session detail beside sidebar

src/app/page.tsx

@@ -291,7 +291,7 @@ export default function Home() {
         onPick={id => setCurrent(sessions.find(s => s.id === id) ?? null)}
         onNew={() => setCurrent(null)}
       />
-      <main className="flex-1 overflow-y-auto">
+      <main className={`flex-1 overflow-y-auto transition-[padding] duration-200 ${current && sidebarOpen ? 'pl-[340px]' : ''}`}>
         <div className="mx-auto max-w-[1240px] px-10 py-8">
           <header className="flex items-center justify-between mb-8 gap-4">
             <div className="flex items-center gap-3 min-w-0">

src/components/Sidebar.tsx

@@ -1,5 +1,6 @@
 'use client';
 
+import { useEffect, useRef, useState } from 'react';
 import type { GenSession } from '@/lib/types';
 
 function modeLabel(mode?: GenSession['inputMode']) {
@@ -87,6 +88,28 @@ export default function Sidebar({
   onPick: (id: string) => void;
   onNew: () => void;
 }) {
+  const rootRef = useRef<HTMLElement | null>(null);
+  const rowRefs = useRef<Record<string, HTMLDivElement | null>>({});
+  const [detailTop, setDetailTop] = useState(140);
+
+  const activeSession = sessions.find(session => session.id === currentId) ?? null;
+
+  function syncDetailTop() {
+    if (!currentId) return;
+    const row = rowRefs.current[currentId];
+    const root = rootRef.current;
+    if (!row || !root) return;
+    const rowRect = row.getBoundingClientRect();
+    const rootRect = root.getBoundingClientRect();
+    const rawTop = rowRect.top - rootRect.top;
+    const maxTop = Math.max(96, rootRect.height - 360);
+    setDetailTop(Math.min(Math.max(96, rawTop), maxTop));
+  }
+
+  useEffect(() => {
+    syncDetailTop();
+  }, [currentId, sessions.length, open]);
+
   if (!open) {
     return (
       <aside className="glass-sidebar w-12 shrink-0 flex flex-col items-center py-4">
@@ -104,7 +127,7 @@ export default function Sidebar({
   }
 
   return (
-    <aside className="flex shrink-0 items-stretch">
+    <aside ref={rootRef} className="relative flex shrink-0 items-stretch overflow-visible">
       <div className="glass-sidebar w-72 shrink-0 flex flex-col">
         <div className="px-4 pt-5 pb-3 flex items-center gap-3">
           <div className="w-8 h-8 rounded-[8px] bg-gradient-to-br from-[#e6f578] to-[#d6b36a] flex items-center justify-center shadow-glow-violet">
@@ -143,7 +166,7 @@ export default function Sidebar({
           最近会话
         </div>
 
-        <div className="flex-1 overflow-y-auto px-3 pb-4 space-y-1">
+        <div className="flex-1 overflow-y-auto px-3 pb-4 space-y-1" onScroll={syncDetailTop}>
           {sessions.length === 0 && (
             <div className="px-3 py-12 text-center text-xs text-white/30">
               还没有生成记录
@@ -153,7 +176,11 @@ export default function Sidebar({
             const selectedCount = s.images.filter(i => i.status === 'selected').length;
             const active = currentId === s.id;
             return (
-              <div key={s.id} className="relative">
+              <div
+                key={s.id}
+                ref={node => { rowRefs.current[s.id] = node; }}
+                className="relative"
+              >
                 <button
                   onClick={() => onPick(s.id)}
                   className={`w-full text-left px-3 py-2.5 rounded-[8px] text-xs transition-all ${
@@ -179,7 +206,6 @@ export default function Sidebar({
                     </span>
                   </div>
                 </button>
-                {active && <ActiveSessionDetail session={s} />}
               </div>
             );
           })}
@@ -189,6 +215,15 @@ export default function Sidebar({
           本地端口 4560 · 数据 / data
         </div>
       </div>
+
+      {activeSession && (
+        <div
+          className="absolute left-full z-30 w-80 pl-3"
+          style={{ top: detailTop }}
+        >
+          <ActiveSessionDetail session={activeSession} />
+        </div>
+      )}
     </aside>
   );
 }