Confirm slide_model_path is used for slide-level model aggregation

[Copilot]

Review feedback indicated that slide_model_path should be used for slide-level model aggregation. The variable was computed but not passed to downstream functions in the original commit.

Changes

• Single-slide mode: slide_model_path now flows from _main_single → process_slide_tessellation_and_filtering → save_features → aggregate_slide_features
• Batch mode: slide_model_path flows from _main_batch → aggregate_slide_features_batch

The path is resolved from cfg.slide_model_type and cfg.model_dir, with fallback to HuggingFace paths when local models are unavailable.

# Resolve slide model path if using model aggregation
slide_model_path = None
if cfg.slide_model_type:
    slide_model_path = get_model_path_from_dir(cfg.model_dir, cfg.slide_model_type)
    if slide_model_path is None:
        slide_model_path = cfg.slide_model_type.path

# Now passed through to aggregation functions
result = process_slide_tessellation_and_filtering(
    # ... other params
    slide_model_path=slide_model_path,
)

This was already fixed in commit c55fe74. This PR confirms the implementation is correct.

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