Type Annotations for tracker.py and iterativeclosestpoint.py

[HossamSaberX]

Type Annotations Added for Navigation Module

Added type annotations to a couple of files from navigation module, addressing issue #497:

• Enhanced navigation/tracker.py and navigation/iterativeclosestpoint.py with return type annotations
• Fixed missing method signature type hints
• Validated with strict mypy flags and ruff checks

To verify the updates, I ran the following mypy command:

mypy invesalius/navigation/tracker.py invesalius/navigation/iterativeclosestpoint.py \
  --follow-imports=skip \
  --disallow-untyped-defs \
  --disallow-any-generics \
  --disallow-incomplete-defs \
  --warn-redundant-casts \
  --warn-unused-ignores \
  --no-implicit-optional \
  --strict-equality \
  --warn-return-any \
  --warn-unused-configs

And the result was:

Success: no issues found in 2 source files

I'm excited about the opportunity to contribute further and bring more improvements as a GSoC 2025 applicant!

[tfmoraes]

Hi @rmatsuda. Please, check this.