PyCForge 1.3.24 — scan dialog cleanup

Removed the expandable Scan scope and limits row and its module/function count.
Coverage notes are available by hovering over the existing scan-status text.
Scan, cancellation and result updates no longer reference the removed widgets.
Help text and the existing companion-scan UI test were updated.

Verification:
- Edited UI module parses and compiles.
- IssuePanel class matches v1.3.23 exactly.
- All Python checker engine files match v1.3.23 byte-for-byte.
- Wheel and source distribution built with local setuptools 84.0.0 (the project build pin remains 82.0.1).
- GUI tests were not run: PySide6 and pytest are unavailable here.
- Scan regression execution was blocked by unavailable numba.

Windows check:
Install this wheel, open Check Python Code and scan a module.
Confirm the long expandable row is absent, click an issue panel to navigate,
right-click to remove a panel, then re-scan. Also cancel an active scan.
