Return null from RegistryCache.GetLabelById for unknown labels

[DevJasperNL]

Proposed change

RegistryCache.GetLabelById used the dictionary indexer, so looking up a label id that is not in the label cache threw a KeyNotFoundException. Every sibling lookup (GetHassEntityById, GetDeviceById, GetAreaById, GetFloorById) already returns null for unknown ids, and HassObjectMapper filters those nulls out with OfType<Label>() when it maps the Labels collections of entities, devices and areas.

Each registry (entities, devices, areas, floors, labels) is reloaded independently and each has its own 5-minute throttle on its *_registry_updated event. This means the entity or area registry can reference a label the label registry has not loaded yet, for example right after a label is created and assigned in the Home Assistant UI. Any app that then touched IHaContext.Registry, entity.Registration, or navigated to an Area/Device threw instead of seeing the entity without that label.

This PR:

• Changes GetLabelById to use GetValueOrDefault, in line with the other lookups. An unknown label is now simply omitted from the mapped Labels lists, and IHaRegistry.GetLabel returns null for it.
• Adds TestUnknownLabelIsIgnored to RegistryNavigationTest. An entity and an area reference a label id that is not in the label registry; the test asserts GetLabel returns null, the entity registration keeps only the known label, and the area has no labels. Without the fix it fails with KeyNotFoundException: The given key 'unknown_label' was not present in the dictionary.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• The code compiles without warnings (code quality check)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration are added/changed:

• Documentation added/updated for https://netdaemon.xyz

[helto4real]

if you are using an agent for these fixes please make it use correct label

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83%. Comparing base (22d654a) to head (e355bc2).

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #1448   +/-   ##
====================================
  Coverage    83%     83%           
====================================
  Files       201     201           
  Lines      4170    4170           
  Branches    486     486           
====================================
+ Hits       3468    3470    +2     
- Misses      497     499    +2     
+ Partials    205     201    -4     

Flag	Coverage Δ
unittests	83% <100%> (+<1%)	⬆️

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[helto4real]

The GetValueOrDefault fix is correct and the unknown-label regression test works: all 153 HassModel tests passed locally, and reverting the production change made the new test fail with KeyNotFoundException. Before approval, please add a focused assertion/test that RegistryCache.GetLabelById(null) returns null (or exercise that path through the concrete HaRegistry.GetLabel method). The modified line currently has only partial branch coverage: local coverage recorded 19 executions but zero hits for the null-id branch, consistent with the failing codecov/patch check. Keep the existing known-label and unknown-label assertions, rerun the HassModel suite with coverage, and ensure codecov/patch is green. No production-code change or coverage-threshold reduction is needed; this request is for the missing null-input test.