fix: LiveQuery matcher crashes when a pointer or typed field value is null

[dblythy]

Closes #7929

Summary by CodeRabbit

• Bug Fixes
  • Fixed query matching for fields explicitly set to null.
  • Cleared pointer fields no longer incorrectly match equalTo constraints.
  • Prevented errors when comparing null values in queries.
  • Added regression coverage for null pointer and non-pointer fields.

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[coderabbitai]

📝 Walkthrough

Walkthrough

LiveQuery equality handling now safely processes null values. Pointer constraints reject cleared pointers, the shared equality helper avoids null dereferences, and regression tests cover pointer and typed fields.

Changes

LiveQuery null equality

Layer / File(s)	Summary
Null-safe equality handling src/LiveQuery/equalObjects.js, src/LiveQuery/QueryTools.js	equalObjects handles null inputs explicitly, while pointer equality rejects null values before reading pointer properties.
Null equality regression coverage spec/QueryTools.spec.js	Adds matchesQuery tests confirming null pointer and typed field values do not match equalTo constraints or throw errors.

Estimated code review effort: 1 (Trivial) | ~5 minutes

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Caution

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

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❌ Failed checks (1 error)

Check name	Status	Explanation	Resolution
Description check	❌ Error	The description only says Closes #7929`` and misses the required Issue, Approach, and Tasks sections.	Add the template sections with a brief issue summary, the approach taken, and the task checklist entries.

✅ Passed checks (6 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses the required fix: prefix and accurately describes the null-handling crash fix.
Linked Issues check	✅ Passed	The changes address #7929 by guarding pointer matching against null and adding regression tests for null values.
Out of Scope Changes check	✅ Passed	The edits stay within LiveQuery null-handling and test coverage; nothing clearly unrelated was introduced.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Security Check	✅ Passed	Patch only adds null guards in LiveQuery matching and regression tests; no new security-sensitive behavior or vuln patterns introduced.
Engage In Review Feedback	✅ Passed	No substantive review feedback is evidenced; only automated review-trigger comments are mentioned, so there’s nothing ignored or prematurely resolved.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.66%. Comparing base (cce91e5) to head (952db2a).
⚠️ Report is 52 commits behind head on alpha.

Additional details and impacted files

@@           Coverage Diff           @@
##            alpha   #10546   +/-   ##
=======================================
  Coverage   92.66%   92.66%           
=======================================
  Files         193      193           
  Lines       16981    16983    +2     
  Branches      248      248           
=======================================
+ Hits        15736    15738    +2     
  Misses       1224     1224           
  Partials       21       21           

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[dblythy]

@coderabbitai full review

[coderabbitai]

✅ Action performed

Full review finished.