Add notify API and add test case for ViewGraphGeometryObservers

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Adds a direct notification API to emit geometry observer callbacks once measurements transition into a pending state.

Changes:

• Introduced `ViewGraphGeometryObservers.notify()` to invoke stored callbacks for pending size changes and commit the pending size as the new stable value.
• Updated the geometry observers test suite to validate callback invocation and old/new size values.
• Added a `TestMeasurer.mockValue` override so tests can deterministically force measurement changes across successive `needsUpdate(graph:)` calls.

Technical Notes: The test triggers a size change via needsUpdate, then calls notify() to flush the pending change into the observer callback path.

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[augmentcode]

Review completed. 2 suggestions posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

If notify() is intended to be part of the same package-level API surface as needsUpdate(graph:) / notifySizes(), consider marking it package (it’s currently internal, so other modules in the package can’t call it). If it’s only meant for tests/internal use, this may be fine.

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[augmentcode]

Since TestMeasurer.mockValue is static, consider resetting it (e.g. via defer { TestMeasurer.mockValue = nil }) to avoid state leaking between tests and creating order-dependent behavior.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 14.31%. Comparing base (c7cd9cf) to head (e4a295b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...UICore/View/Graph/ViewGraphGeometryObservers.swift	0.00%	11 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (c7cd9cf) and HEAD (e4a295b). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (c7cd9cf)	HEAD (e4a295b)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #699       +/-   ##
===========================================
- Coverage   28.80%   14.31%   -14.50%     
===========================================
  Files         589      563       -26     
  Lines       35794    33167     -2627     
===========================================
- Hits        10312     4748     -5564     
- Misses      25482    28419     +2937     

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