Fix TODO - mypy ignored modules

[omkar-334]

Before submitting

• Self-reviewed the code
• All tests pass locally

Description

• pyproject.toml — removed 3 stale ignore_errors overrides for smoother, skeletons, metrics.utils.utils
  • key_points/skeletons.py — removed Edges type annotations from 4 enum members (mypy requires enum members to be unannotated)
  • detection/tools/smoother.py — added type annotation for tracks, used cast for getitem return, renamed track → valid to fix type narrowing

Type of Change

• 🔨 Refactoring (no functional changes)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75%. Comparing base (c010656) to head (15339e2).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #2172   +/-   ##
=======================================
  Coverage       75%     75%           
=======================================
  Files           62      62           
  Lines         7545    7546    +1     
=======================================
+ Hits          5648    5649    +1     
  Misses        1897    1897           

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