[UI tests] Add accessibility IDs to FancyZones to fix part UI tests (#41316)

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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
Not sure why some text changed — for example, this button was ‘Launch
layout editor’, but in the UI it now shows as ‘Open layout editor’, so
it can’t be found :
<img width="1159" height="87" alt="image"
src="https://github.com/user-attachments/assets/d407a8fc-2876-4a85-9637-14d5923493d2"
/>

But using accessibility IDs is always more reliable.



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## PR Checklist

- [ ] Closes: #xxx
- [ ] **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
- [ ] **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

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## Validation Steps Performed

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

@@ -168,6 +168,7 @@ callbackptr
 calpwstr
 Cangjie
 CANRENAME
+Canvascustomlayout
 CAPTUREBLT
 CAPTURECHANGED
 CARETBLINKING
@@ -574,6 +575,7 @@ GPOCA
 gpp
 gpu
 gradians
+Gridcustomlayout
 GSM
 gtm
 guiddata