Improve contextual help and download filter grouping

Open contextual help from wrapper hover and focus, close it only after pointer or focus exits the shared trigger-popover region, and make clicks open-only. Remove the standalone package title and present the existing download filters as the first compact neutral sidebar group without changing filter behavior. Extend the visual driver and manifest with hover, leave, focus, blur, internal-focus, and real headless Chromium regression coverage.

tests/visual/driver-test.tsx

@@ -1,5 +1,6 @@
 import { useState } from "react";
 import { createRoot } from "react-dom/client";
+import { ContextInfoButton } from "../../src/renderer/ui/ContextInfoButton";
 import {
   loadVisualCapture,
   prepareVisualCapture,
@@ -23,6 +24,7 @@ function DriverTestApp({ updateAvailable }: { updateAvailable: boolean }) {
   const [updateDialogOpen, setUpdateDialogOpen] = useState(updateAvailable);
   const [updateTooltipOpen, setUpdateTooltipOpen] = useState(false);
   const [infoOpen, setInfoOpen] = useState(false);
+  const [infoTransitions, setInfoTransitions] = useState<boolean[]>([]);
 
   return (
     <>
@@ -48,8 +50,16 @@ function DriverTestApp({ updateAvailable }: { updateAvailable: boolean }) {
               <div role="row">Dokumentation Staffel 1</div>
             </div>
             <div data-visual-region="downloads-pagination">Seite 1 von 1</div>
-            <button type="button" onClick={() => setInfoOpen((open) => !open)}>Informationen</button>
-            {infoOpen && <section aria-label="Informationen zu Downloads">Drei Downloads sind sichtbar.</section>}
+            <ContextInfoButton
+              content={<><span>Drei Downloads sind sichtbar.</span><button type="button">Kontextaktion</button></>}
+              contextName="Downloads"
+              onOpenChange={(open) => {
+                setInfoTransitions((transitions) => [...transitions, open]);
+                setInfoOpen(open);
+              }}
+              open={infoOpen}
+            />
+            <output data-context-info-transitions={infoTransitions.map((open) => open ? "open" : "closed").join(",")} />
           </>
         )}
         {activeView === "collector" && (