When tasks.json contains string IDs (e.g., "5" instead of 5), task lookups
fail because the code uses parseInt() and strict equality (===) for comparisons.
This fix normalizes all task and subtask IDs to numbers when loading the JSON,
ensuring consistent comparisons throughout the codebase without requiring
changes to multiple comparison locations.
Fixes task not found errors when using string IDs in tasks.json.
b79eb4f7a2