<!-- 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
Migrate WPF/WinForms utility to WinUI3 can give us many benefit.
1. Only WinUI3 support AOT. By this change, we can remove the blocker to
make imageResizer publish with AOT enabled to improve the performance.
Through the previous testing in CmdPal, it can improve about 1.5x to 3x
perf.
2. WinUI 3 provides a modern UI and makes sure that our experiences fit
in with the Windows 11 look and feel.
3. We can merge many redundant code to the same one and reduce more
codebase and installed size in the future if we successfully migrate all
remaining WPF/WinForms utility to WinUI3.
<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist
- [x] Closes: #46465
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **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
1. Set up the ImageResizer as the startup project.
2. Start in visual studio.
---------
Co-authored-by: Yu Leng (from Dev Box) <yuleng@microsoft.com>
Co-authored-by: Niels Laute <niels.laute@live.nl>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
<!-- 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
Adds a dedicated command-line interface (CLI) executable for Image
Resizer (PowerToys.ImageResizerCLI.exe)
## Command
`PowerToys.ImageResizerCLI.exe [options] [files...]`
## Options (High Level)
| Option (aliases) | Description |
|-----------------|-------------|
| `--help` | Show help |
| `--show-config` | Print current effective configuration |
| `--destination`, `-d` | Output directory (optional) |
| `--width`, `-w` | Width |
| `--height`, `-h` | Height |
| `--unit`, `-u` | Unit (Pixel / Percent / Inch / Centimeter) |
| `--fit`, `-f` | Fit mode (Fill / Fit / Stretch) |
| `--size`, `-s` | Preset size index (supports `0` for Custom) |
| `--shrink-only` | Only shrink (do not enlarge) |
| `--replace` | Replace original |
| `--ignore-orientation` | Ignore EXIF orientation |
| `--remove-metadata` | Strip metadata |
| `--quality`, `-q` | JPEG quality (1–100) |
| `--keep-date-modified` | Preserve source last-write time |
| `--file-name` | Output filename format |
## Example usage
```
# Show help
PowerToys.ImageResizerCLI.exe --help
# Show current config
PowerToys.ImageResizerCLI.exe --show-config
# Resize with explicit dimensions
PowerToys.ImageResizerCLI.exe --width 800 --height 600 .\image.png
# Use preset size 0 (Custom) and output to a folder
PowerToys.ImageResizerCLI.exe --size 0 -d "C:\Output" .\photo.png
# Preserve source LastWriteTime
PowerToys.ImageResizerCLI.exe --width 800 --height 600 --keep-date-modified -d "C:\Output" .\image.png
```
<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist
- [ ] Closes: #xxx
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass
- [x] **Localization:** All end-user-facing strings can be localized
- [x] **Dev docs:** Added/updated
- [x] **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
