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<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
This PR adds support for detecting missing video codecs during video
file preview, and displays a warning message to inform the user when the
required codec is not installed.
### Changes
- Added `GetMissingCodecAsync` to detect unsupported video formats using
`MediaEncodingProfile` and `CodecQuery`.
- If a required codec is missing, display a warning in the preview UI.
- Added localized string `MissingVideoCodec_WarningMessage`:
> "This video uses the {0} format, which isn't supported. Please install
the required codec to play it."
- Add Store Search
<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist
- [x] **Closes:** https://github.com/microsoft/PowerToys/issues/39235,
https://github.com/microsoft/PowerToys/issues/38201
- [ ] **Communication:** I've discussed this with core contributors
already. If work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [x] **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
<!-- Provide a more detailed description of the PR, other things fixed
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments
<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
To simulate a missing codec (e.g., AV1):
1. Check if the AV1 extension is installed:
```powershell
Get-AppxPackage -Name *AV1*
2. If installed, remove it:
```powershell
Get-AppxPackage -Name *AV1* | Remove-AppxPackage
3. Use Peek to preview a video encoded in AV1 format.
4. Confirm that a warning message is shown indicating the missing codec.