Fix open model filter callback reliability

#38
OpenHands org

Cache embedded image assets reused by leaderboard callbacks and harden the open-model size chart when openness metadata is unavailable. This keeps the open-model filter from doing repeated asset encoding work and prevents missing metadata from surfacing as a Gradio connection error.

Fixes OpenHands/openhands-index-results#1227.

juan-all-hands changed pull request status to merged

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