Fix progress_bar return type annotation: Collection → Iterator[T]

[Copilot]

progress_bar is a generator but was annotated -> Collection, which is both semantically wrong and misleading to type checkers and callers.

Changes

• src/dev_tools/progress_bar.py
  • Introduce TypeVar T
  • Parameterise input as Collection[T] — preserves the len() (Sized) constraint
  • Change return type to Iterator[T] — accurately reflects the generator behaviour

# Before
def progress_bar(iterable: Collection, ...) -> Collection: ...

# After
T = TypeVar("T")
def progress_bar(iterable: Collection[T], ...) -> Iterator[T]: ...

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