New module: AltWindowCycle (#48281)

## Summary of the Pull Request

Introduces a new utility: AltWindowCycle to quickly switch between
windows from the same process using Alt + `.

In release notes give @wzhudev coauthor credits as he also had an
earlier PR

It works like Alt + Tab, but scoped to the app you’re already in.
Perfect for juggling multiple browser windows, terminals, or editor
instances.


https://github.com/user-attachments/assets/cd42f6af-fa5d-4f08-8f68-3c4e75c16d94

<img width="1835" height="971" alt="image"
src="https://github.com/user-attachments/assets/adea59cb-6c8d-4b44-87e2-0a792c4c0b4f"
/>

## PR Checklist

- [x] Closes: https://github.com/microsoft/PowerToys/issues/278
- [ ] **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

## Detailed Description of the Pull Request / Additional comments

This PR adds AltWindowCycle (in-proc module + Settings integration),
then addresses follow-up check-spelling feedback without changing
runtime behavior:
- allow-list update for `ROOTOWNER`
- comment text adjustment for forbidden-pattern compliance
- local identifier rename (`wpx` → `whitePx`) for spelling compliance

## Validation Steps Performed

- Verified `ROOTOWNER` is present in
`.github/actions/spell-check/allow/code.txt`
- Verified `wpx` is removed and updated occurrences in
`src/modules/AltWindowCycle/AltWindowCycle.cpp`
- Ran targeted diff/verification for both updated files
- Ran final validation (code review + CodeQL trivial-change path)
- Ran secret scan for changed files

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Niels Laute <niels.laute@live.nl>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Clint Rutkas <crutkas@users.noreply.github.com>
Copilot-Session: dd5080ea-5001-4efb-87f8-1e7218e10a4e

.github/actions/spell-check/allow/code.txt

@@ -330,6 +330,7 @@ xes
 PACKAGEVERSIONNUMBER
 APPXMANIFESTVERSION
 PROGMAN
+ROOTOWNER
 
 # MRU lists
 CACHEWRITE

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

@@ -10,6 +10,7 @@ ACCESSDENIED
 ACCESSTOKEN
 acfs
 ACIE
+ACRYLICBLURBEHIND
 acrt
 ACTIVATEAPP
 ACTIVATEOPTIONS
@@ -93,6 +94,7 @@ ASSOCSTR
 ASYNCWINDOWPLACEMENT
 ASYNCWINDOWPOS
 atl
+AWC
 ATRIOX
 aumid
 AUO
@@ -465,6 +467,7 @@ dwm
 dwmapi
 DWMCOLORIZATIONCOLORCHANGED
 DWMCOMPOSITIONCHANGED
+DWMSBT
 DWMNCRENDERINGCHANGED
 Dwmp
 DWMSENDICONICLIVEPREVIEWBITMAP
@@ -1391,6 +1394,7 @@ pnid
 PNMLINK
 Poc
 Podcasts
+PARGB
 POINTERID
 POINTERUPDATE
 Pokedex
@@ -1857,6 +1861,7 @@ SYSLIB
 sysmenu
 systemai
 SYSTEMAPPS
+SYSTEMBACKDROP
 SYSTEMMODAL
 systemroot
 SYSTEMTIME
@@ -1931,6 +1936,7 @@ tracerpt
 trackbar
 trafficmanager
 transicc
+TRANSIENTWINDOW
 transitioning
 TRAYMOUSEMESSAGE
 triaging
@@ -2075,7 +2081,7 @@ WANTNUKEWARNING
 WANTPALM
 WASDK
 wbem
-Wca
+wca
 WCE
 wcex
 WCRAPI
@@ -2103,6 +2109,7 @@ winappcli
 winappsdk
 windir
 WINDOWCREATED
+WINDOWCOMPOSITIONATTRIBDATA
 WINDOWDESTROYED
 windowedge
 WINDOWINFO