fix(task-drawer): render as side column without modal overlay when opened from assistant

frontend/src/lib/components/layout/TaskDrawer.svelte

@@ -64,9 +64,9 @@
     window.location.href = "/reports";
   }
 
-  // Handle overlay click
-  function handleOverlayClick(event) {
-    if (event.target === event.currentTarget) {
+  function handleGlobalKeydown(event) {
+    if (!isOpen) return;
+    if (event.key === "Escape") {
       handleClose();
     }
   }
@@ -192,25 +192,16 @@
   });
 </script>
 
-<!-- Drawer Overlay -->
+<svelte:window on:keydown={handleGlobalKeydown} />
+
 {#if isOpen}
-  <div
-    class="fixed inset-0 z-[69] bg-black/35 backdrop-blur-sm"
+  <aside
+    class="fixed top-0 z-[70] flex h-full w-full max-w-[560px] flex-col border-l border-slate-200 bg-white shadow-[-8px_0_30px_rgba(15,23,42,0.15)] transition-[right] duration-300 ease-out"
     style={`right: ${assistantOffset};`}
-    on:click={handleOverlayClick}
-    on:keydown={(e) => e.key === 'Escape' && handleClose()}
-    role="button"
-    tabindex="0"
-    aria-label={$t.tasks?.close_drawer || "Close drawer"}
+    role="dialog"
+    aria-modal="false"
+    aria-label={$t.tasks?.drawer || "Task drawer"}
   >
-    <!-- Drawer Panel -->
-    <div
-      class="fixed top-0 z-[72] flex h-full w-full max-w-[560px] flex-col border-l border-slate-200 bg-white shadow-[-8px_0_30px_rgba(15,23,42,0.15)] transition-[right] duration-300 ease-out"
-      style={`right: ${assistantOffset};`}
-      role="dialog"
-      aria-modal="true"
-      aria-label={$t.tasks?.drawer || "Task drawer"}
-    >
       <!-- Header -->
       <div class="flex items-center justify-between border-b border-slate-200 bg-white px-5 py-3.5">
         <div class="flex items-center gap-2.5">
@@ -304,8 +295,7 @@
           {$t.tasks?.footer_text || 'Task continues running in background'}
         </p>
       </div>
-    </div>
-  </div>
+  </aside>
 {/if}
 
 <!-- [/DEF:TaskDrawer:Component] -->