Blizzard Source Code (V2.1.3)

[PWARDS-weather]

Consolidates structural changes introduced in the Blizzard release. Refactors the startup
sequence for non-blocking initialization, upgrades the bootloader UI to a dark theme with
smooth progress animation, and introduces a modular satellite data processing pipeline.
Includes fixes for the grid masking, .dat decoding, and RGB product loading bugs resolved
in 2.1.3. Legacy source files and outdated READMEs have been removed.

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Changes

• Monson.py — Threaded startup via background_tasks(); silent subprocess execution
  via pythonw.exe; proper finally block for clean bootloader teardown
• Bootloader — Dark theme (#1e1e1e); smooth animate_progress_to() progress bar;
  Image.Resampling.LANCZOS for Pillow 10+ compatibility
• bg_extract.py — Concurrent .bz2 decompression (ThreadPoolExecutor, 8 workers)
• bg_decode.py — Himawari AHI .dat → GeoTIFF via Satpy; source files deleted only
  after confirmed .tif output
• bg_product.py — Satellite product generation pipeline
• Process_dat.py — Processing orchestration with GUI-compatible output parsing
• latest_symlink.py — Fixed project root path resolution; corrected UTC rounding
  (−30 min offset); added post-download file-size verification
• data/coastlines/ — Bundled Natural Earth ne_10m_coastline shapefiles (v5.0.0-pre9)
• Removed — README_old2.md, readme_old.md, legacy run.bat, stale src/,
  public/images/, and Process/__pycache__

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Notes for Reviewers

• boot.run() must be called on the main thread — Tkinter will fail silently otherwise
• bg_decode.py requires satpy; exits immediately if not installed
• Satellite imagery falls back to infrared band B13 outside 08:00–16:00 PHT