Added typing tooling/deps in pyproject.toml

Added pandas-stubs to dev dependencies.

Kept ty in dev dependencies.

Added global ty rule config: unresolved-attribute = "ignore"

Added/updated type hints and type-safety fixes across source files:

Integrated pre-commit typing

Updated .pre-commit-config.yaml with a local hook

Integrated CI typing as a second job in same workflow

• added new type-check job

Bugs discovered and fixed

Real syntax bug: multiple files used legacy Python 2 exception syntax (except A, B:), which is invalid in Python 3. Fixed to except (A, B): in affected files (controllers/views/utils/ui).

Potential runtime typing issues fixed:

• Safer handling of optional file paths before open()/unlink().
• DataFrame indexing/selection paths adjusted to avoid ambiguous Series | DataFrame behavior in exporter logic.
• Explicit typing around Qt/pandas boundaries where inference was too loose.

Unsolvable / constrained typing issues

• The major remaining ecosystem limitation is PySide6 attribute resolution noise (enum/attribute surface and dynamic Qt patterns), which generated high-volume false positives under ty.
• Temporarily added unresolved-attribute = "ignore"

Addresses Improve type hints and add type checking #32