Add AppUserModel_ID awareness to FancyZones

[jsclary]

Summary of the Pull Request

This change allows FancyZones to distinguish between logically distinct windows of the same executable like browser profiles, progressive web apps and others where the shell normally gives them separate taskbar icons.

PR Checklist

• Closes: Move newly created windows to last known zone Chrome and PWA #34713
• 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 for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Applications that set their shell AppUserModel_ID (mostly browsers) will need to be repositioned once immediately after updating to a version that includes this.

To remain backward compatible for all other applications, the json variable remains "app-path" even though the conditionally appended "?<AppUserModel_ID>" for some windows means it is no longer always a valid path. It is never actually used as a path, however. It is merely a key for the Map. The '?' separator, being illegal in a filename on Windows, makes it easy to strip off if anyone ever needs to do so in future. I similarly left the internal variable name as processPath, mostly just to minimize the size of the diff.

Validation Steps Performed

The build succeeds on my Windows 11 system and I've been running with it on my daily driver for two days with heavy use of PWAs and profiles on Chrome, Edge and Brave. I don't have a Windows 10 system or image to make a VM but I don't see any changes in the shell API that's used here. Firefox doesn't implement the necessary shell integration natively so its behavior doesn't change but the native helper for the third party PWA extension might.

[jsclary]

@microsoft-github-policy-service agree

[Copilot]

Pull Request Overview

This PR enhances FancyZones to use AppUserModel_ID to distinguish between logically distinct windows of the same executable, such as browser profiles and progressive web apps that typically receive separate taskbar icons.

• Adds a new method GetProcessPathWithAUMID() that retrieves both process path and AppUserModel_ID
• Updates all existing calls to use the new combined identifier instead of just process path
• Maintains backward compatibility by keeping the JSON field name as "app-path" despite now containing additional data

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
AppZoneHistory.h	Declares new GetProcessPathWithAUMID() static method
AppZoneHistory.cpp	Implements AppUserModel_ID retrieval and updates all process path calls to use the enhanced identifier

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