feat: infer property types from constructor assignments

[lucasacoutinho]

Properties without explicit type declarations can now have their types inferred when they’re assigned using new ClassName().

This works in both cases:
Promoted constructor parameters with defaults (e.g. private $repo = new Repository())
Assignments inside the constructor (e.g. $this->repo = new Repository())

As a result, features like go-to-definition and autocomplete work correctly for chained calls such as $this->repo->findById(), even when the property itself isn’t typed. This is especially useful for legacy codebases and modern PHP 8.1+ patterns that rely on inline object instantiation.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.04651% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.03%. Comparing base (50e46d2) to head (981d252).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/parser/classes.rs	78.43%	11 Missing ⚠️
src/completion/phpdoc/generation.rs	97.14%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #81   +/-   ##
=======================================
  Coverage   87.02%   87.03%           
=======================================
  Files         153      153           
  Lines       93589    93673   +84     
=======================================
+ Hits        81450    81526   +76     
- Misses      12139    12147    +8     

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[AJenbo]

Interesting addition, personally I think projects should just hint there code properly since there's a lot of pitfalls in trying to infer from code what the signature should be, but this is nicely contained.

I added an extra check to make sure it doesn't trigger if there's any other forms of types on the property. I also hooked it up to the PHPDoc generation logic which adds a nice syngery effect where the LSP can now generate plausible types which the developer can then correct in necessary.