focus-zone: start of fabric implementations for both macos and windows

[Jason Morse (JasonVMo)]

Platforms Impacted

• iOS
• macOS
• win32 (Office)
• windows
• android

Description of changes

This has two main changes:

• moves focus zone to a primitive based implementation, rather than being based on a particular legacy framework
• adds macos and windows fabric implementations.

The fabric implementations still have bugs but are a good starting point.

[github-actions]

Bundle size report

Tree-shaken production Metro bundles. Component costs are relative to their platform shell; shell costs are absolute.

Platform	Scenario	Baseline cost	Current cost	Cost delta	Change	Gzip delta	Module delta
macos	shell	801.3 KiB	801.3 KiB	0.0 KiB	0.00%	0.0 KiB	+0
macos	components-button	50.1 KiB	50.2 KiB	+0.2 KiB	+0.34%	+0.0 KiB	+2
macos	components-catalog	267.3 KiB	273.7 KiB	+6.4 KiB	+2.38%	+2.3 KiB	+9
macos	design-theme-state	33.3 KiB	33.4 KiB	+0.1 KiB	+0.40%	+0.1 KiB	+2
macos	design-color-lib	New	7.1 KiB	New	New	New	New
macos	design-theme-state-legacy-source	35.3 KiB	35.5 KiB	+0.1 KiB	+0.38%	+0.0 KiB	+2
macos	design-legacy-theme-from-flex	100.2 KiB	100.4 KiB	+0.1 KiB	+0.13%	+0.1 KiB	+2
windows	shell	810.2 KiB	810.2 KiB	0.0 KiB	0.00%	0.0 KiB	+0
windows	components-button	50.0 KiB	50.2 KiB	+0.2 KiB	+0.34%	+0.0 KiB	+2
windows	components-catalog	267.0 KiB	273.4 KiB	+6.4 KiB	+2.38%	+2.3 KiB	+9
windows	design-theme-state	33.2 KiB	33.3 KiB	+0.1 KiB	+0.41%	+0.1 KiB	+2
windows	design-color-lib	New	7.1 KiB	New	New	New	New
windows	design-theme-state-legacy-source	35.3 KiB	35.4 KiB	+0.1 KiB	+0.38%	+0.0 KiB	+2
windows	design-legacy-theme-from-flex	100.0 KiB	100.1 KiB	+0.1 KiB	+0.13%	+0.1 KiB	+2

The job is advisory: size changes are reported but do not fail the pull request. Bundle or analysis errors still fail.

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