[CmdPal] Fix filters visibility on non-ListPage (#42828)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request
This PR aims to fix the issue where filters from a ListPage remain
visible when navigating to other pages.
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## PR Checklist

- [x] Closes: #42827 
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments
### Before:

![FiltersIssue](https://github.com/user-attachments/assets/b0ad6059-9a11-4e12-821d-7202358e25bb)

### After:

![FiltersFix](https://github.com/user-attachments/assets/b9ee71ee-cb5d-4ef9-b9fc-bc2e2a710b5c)

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## Validation Steps Performed

---------

Co-authored-by: Jiří Polášek <me@jiripolasek.com>

src/modules/cmdpal/ext/SamplePagesExtension/SamplesListPage.cs

@@ -5,6 +5,7 @@
 using Microsoft.CommandPalette.Extensions;
 using Microsoft.CommandPalette.Extensions.Toolkit;
 using SamplePagesExtension.Pages;
+using SamplePagesExtension.Pages.IssueSpecificPages;
 
 namespace SamplePagesExtension;
 
@@ -106,6 +107,11 @@ public partial class SamplesListPage : ListPage
         {
             Title = "Evil samples",
             Subtitle = "Samples designed to break the palette in many different evil ways",
+        },
+        new ListItem(new AllIssueSamplesIndexPage())
+        {
+            Title = "Issue-specific samples",
+            Subtitle = "Samples designed to reproduce specific issues",
         }
     ];