v0.9.2-beta

Improved auto-image selection & added Type Hints

Enhanced auto_select_images() logic:

• If only one collage image exists and abort_incomplete_001_004 = 2, it is used as 001, while 002-004 are automatically reconstructed.
• Improved image selection based on target orientation (portrait/landscape).
• Optimized image distribution according to the 0.3 / 0.6 / 0.9 formula.

New function get_target_aspect():

• Dynamically calculates target aspect ratio based on config settings.
• Supports manual aspect ratio (manual_aspect_ratio).

Standardized use of Type Hints across all relevant functions.
Resampling method remains LANCZOS for highest quality scaling.
Minor optimizations & improved error handling.