ui(assets): move AI assistant to the bottom feedback position

src/modules/assets/AssetsModule.tsx

@@ -1,6 +1,7 @@
 import React, { lazy, Suspense, useState, useEffect, useCallback, useMemo, useRef } from 'react';
 import {
   Truck,
+  Sparkles,
   ChevronDown,
   ChevronRight,
   Loader2,
@@ -483,8 +484,6 @@ export default function AssetsModule() {
   return (
     <div className="min-h-screen bg-[var(--app-bg)] text-gray-800 font-sans p-3 md:p-6 relative">
       <AssetsHeader
-        assistantTrigger={assistantTrigger}
-        onOpenAssistant={() => setAssistantOpen(true)}
         activeTab={activeTab}
         setActiveTab={setActiveTab}
         theme={theme}
@@ -1708,6 +1707,18 @@ export default function AssetsModule() {
 
       </div>
       <RotatingFooterHint className="pb-4" />
+      <button
+        ref={assistantTrigger}
+        type="button"
+        onClick={() => setAssistantOpen(true)}
+        aria-label="打开 AI 问数"
+        aria-haspopup="dialog"
+        aria-expanded={assistantOpen}
+        className="fixed bottom-[calc(5rem+env(safe-area-inset-bottom))] right-4 z-[60] inline-flex min-h-12 items-center gap-2 rounded-full bg-gradient-to-br from-blue-600 to-cyan-500 px-4 text-sm font-semibold text-white shadow-lg shadow-blue-200 transition hover:from-blue-700 hover:to-cyan-600 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-500 focus-visible:ring-offset-2 md:bottom-6 md:right-6"
+      >
+        <Sparkles size={20} aria-hidden="true" />
+        AI 问数
+      </button>
       {assistantOpen && <Suspense fallback={<div role="status" className="fixed bottom-20 right-6 z-50 rounded-xl bg-white p-4 text-slate-900 shadow-lg">正在打开 AI 问数…</div>}><AssetAssistant key={selectedSubject || 'all'} subject={selectedSubject} appearance="light" close={() => { setAssistantOpen(false); requestAnimationFrame(() => assistantTrigger.current?.focus()); }} /></Suspense>}
     </div>
   );