fix(ui): Make Tasks Dashboard header sticky

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cannaiq/src/pages/TasksDashboard.tsx

@@ -256,7 +256,8 @@ export default function TasksDashboard() {
   return (
     <Layout>
       <div className="space-y-6">
-        {/* Header */}
+        {/* Sticky Header */}
+        <div className="sticky top-0 z-10 bg-white pb-4 -mx-6 px-6 pt-2 border-b border-gray-200 shadow-sm">
           <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
             <div>
               <h1 className="text-2xl font-bold text-gray-900 flex items-center gap-2">
@@ -320,6 +321,7 @@ export default function TasksDashboard() {
             <span className="text-sm text-gray-400">Auto-refreshes every 15s</span>
             </div>
           </div>
+        </div>
 
         {error && (
           <div className="p-4 bg-red-50 text-red-700 rounded-lg">{error}</div>