Implement "Explore" page using existing custom Subgraph integration from Streamlit

We need to port the explore page from the existing Streamlit app to achieve feature parity

Eventually we will swap the custom GraphQL integration out for Subgrounds, but right now let's just port it as-is to Dash to avoid making Subgrounds a blocker for Playgrounds

Find the existing Streamlit app's explore page and its custom GraphQL integration. Understand how to replicate this in Dash, focusing on the GraphQL queries and data handling. The goal is a functional Dash page matching the Streamlit feature set, using the current integration, not Subgrounds.

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