Spawn point Y coordinate updates were failing with "Latitude X not in range -90.0..=90.0" errors for locations where longitude exceeds ±90 degrees (e.g., Asia, Pacific regions).

Root cause: When reconstructing bbox strings for LLBBox::from_str(), coordinate accessors were called in wrong order, causing longitude values to be validated as latitude.

Change: Swapped accessor order in bbox_string formatting (data_processing.rs:287-290)

// Before: produced incompatible format
let bbox_string = format!("{},{},{},{}", 
    args.bbox.min().lng(), args.bbox.min().lat(),
    args.bbox.max().lng(), args.bbox.max().lat());

// After: matches LLBBox::from_str() expectations  
let bbox_string = format!("{},{},{},{}",
    args.bbox.min().lat(), args.bbox.min().lng(),
    args.bbox.max().lat(), args.bbox.max().lng());

This ensures reconstructed bbox strings use the same format as the original GUI input, allowing LLBBox::from_str() to parse them correctly.

• Fixes [BUG] Failed to update spawn point Y coordinate #659

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