TopIso3D v2026 pre-release

Pre-release of TopIso3D v2026 for cross-platform validation.

Main updates in this version:

• Windows console-popup issue fixed when calling properties
• PL2D execution moved to background to keep GUI responsive
• Abort support improved for TRHO, TLAP and ATBP
• ATBP parsing and failure detection improved
• External result-file names configurable in Settings
• Multi-run selection improved for TRHO, TLAP and ATBP
• Several GUI refinements based on early user feedback

This version is being distributed for validation and testing.