Add 85 C++ MSTest tests for FancyZones

[crutkas]

Summary

85 new TEST_METHODs covering FancyZones:

• Layout calculations: columns, rows, grid, priority grid, focus
• Keyboard snap: index-based navigation, position-based, extend selection
• Data structures: AppliedLayouts, CustomLayouts, LayoutHotkeys JSON parsing
• Device ID parsing: valid/invalid formats, serial numbers
• Engine lifecycle: drag start/move/end, cancel, shift-drag

Split from #46905 (1/7) — see that PR for full context.

Files Changed (4)

• src/modules/fancyzones/FancyZonesTests/UnitTests/FancyZones.Tests.cpp (new)
• src/modules/fancyzones/FancyZonesTests/UnitTests/UnitTests.vcxproj (modified)
• src/modules/fancyzones/FancyZonesTests/UnitTests/UnitTests.vcxproj.filters (modified)
• .github/actions/spell-check/expect.txt (modified)

[crutkas]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[DHowett]

An engineer--not a computer--needs to verify each of these test cases to ensure that they are worthwhile and on-target.

[github-actions]

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curl -s -S -L 'https://raw.githubusercontent.com/check-spelling/check-spelling/cfb6f7e75bbfc89c71eaa30366d0c166f1bd9c8c/apply.pl' |
perl - 'https://github.com/microsoft/PowerToys/actions/runs/24324978170/attempts/1' &&
git commit -m 'Update check-spelling metadata'

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