[UI tests] Add full UI test coverage for Peek based on release checklist (#40734)

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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
Add full UI test coverage for Peek based on release checklist

### Peek
 * Open different files to check that they're shown properly
   - [x] Image
   - [x] Text or dev file
   - [x] Markdown file
   - [ ] PDF
   - [x] Archive files (.zip, .tar, .rar)
- [x] Any other not mentioned file (.exe for example) to verify the
unsupported file view is shown

 * Pinning/unpinning
- [x] Pin the window, switch between images of different size, verify
the window stays at the same place and the same size.
- [x] Pin the window, close and reopen Peek, verify the new window is
opened at the same place and the same size as before.
- [x] Unpin the window, switch to a different file, verify the window is
moved to the default place.
- [x] Unpin the window, close and reopen Peek, verify the new window is
opened on the default place.

* Open with a default program
   - [x] By clicking a button.
   - [x] By pressing enter. 

- [x] Switch between files in the folder using `LeftArrow` and
`RightArrow`, verify you can switch between all files in the folder.
- [x] Open multiple files, verify you can switch only between selected
files.

<img width="519" height="266" alt="image"
src="https://github.com/user-attachments/assets/f27c555d-9939-476f-9ecc-50d598285aef"
/>


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## PR Checklist

- [x] **Closes:**
#[40676](https://github.com/microsoft/PowerToys/issues/40676)
- [ ] **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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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

.github/actions/spell-check/expect.txt

@@ -1615,6 +1615,8 @@ svgz
 SVSI
 SWFO
 SWP
+SWPNOSIZE
+SWPNOZORDER
 SWRESTORE
 symbolrequestprod
 SYMCACHE