fix: align thumbnail style with Haikyuu reference

[google-labs-jules]

This pull request updates the thumbnail.py script to exactly match the requested "Anime Flicker" (Haikyuu) style.

Key changes:

• Poster Design: Switched to a large-scale hexagonal mask for the poster image with prominent white outlines, matching the provided reference.
• Background: Adjusted the background grid to be subtle and dark.
• Typography: Updated font sizes and spacing to align with the visual design.
• Fixes: Corrected a font loading issue where a missing font would cause the script to fall back to the default font, breaking the design.
• Cleanup: Removed output.log and compiled python files.

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PR created automatically by Jules for task 1981037527878897757 started by @botmaker00

[google-labs-jules]

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