Prevent collector snapshot rerender stalls

Memoize the collector content across unrelated app snapshots and release collapsed child rows from the DOM after their closing animation. Draw the idle speed sparkline as a pixel-aligned one-physical-pixel stroke so its thickness remains uniform across display scales.

src/renderer/views/collector/CollectorView.tsx

@@ -1,4 +1,4 @@
-import type { ChangeEvent, ReactElement } from "react";
+import { memo, useEffect, useState, type ChangeEvent, type ReactElement } from "react";
 import { formatDateTime, formatHosterLabel, humanSize } from "../../download-format";
 import { DataTable, DataTableBody, DataTableEmpty, DataTableHeader } from "../../ui/DataTable";
 import { Dialog } from "../../ui/Dialog";
@@ -165,7 +165,19 @@ function CollectorPackageGroup({ row, model, actions, selected }: {
   const allSelected = row.selectedCount === row.totalCount;
   const partiallySelected = row.selectedCount > 0 && !allSelected;
   const animateItems = model.animationsEnabled && row.allLinks.length <= 64;
-  const renderItems = !row.collapsed || animateItems;
+  const [renderItems, setRenderItems] = useState(!row.collapsed);
+  useEffect(() => {
+    if (!row.collapsed) {
+      setRenderItems(true);
+      return;
+    }
+    if (!animateItems) {
+      setRenderItems(false);
+      return;
+    }
+    const timer = window.setTimeout(() => setRenderItems(false), 300);
+    return () => window.clearTimeout(timer);
+  }, [animateItems, row.collapsed]);
   return (
     <div className={`collector-package-group${row.collapsed ? " is-collapsed" : ""}${model.animationsEnabled ? " is-motion-enabled" : ""}`} role="rowgroup">
       <div className={`collector-package-row${row.selectedCount > 0 ? " is-selected" : ""}`} role="row">
@@ -256,16 +268,21 @@ export function CollectorContent({ model, actions }: CollectorViewProps): ReactE
   );
 }
 
+export const MemoizedCollectorContent = memo(
+  CollectorContent,
+  (previous, next) => previous.model === next.model
+);
+
 export function CollectorView({ model, actions, region = "all" }: CollectorViewProps): ReactElement {
   if (region === "sidebar") return <CollectorSidebar actions={actions} model={model} />;
   if (region === "toolbar") return <CollectorToolbar actions={actions} model={model} />;
-  if (region === "content") return <CollectorContent actions={actions} model={model} />;
+  if (region === "content") return <MemoizedCollectorContent actions={actions} model={model} />;
   return (
     <div className="collector-view">
       <CollectorSidebar actions={actions} model={model} />
       <div className="collector-view-main">
         <CollectorToolbar actions={actions} model={model} />
-        <CollectorContent actions={actions} model={model} />
+        <MemoizedCollectorContent actions={actions} model={model} />
       </div>
     </div>
   );