HF RL Explorer

Redesign dictionary ID system and add columnFromValues builder method

Redesign dictionary ID system and add columnFromValues builder method: a task in LegoFlow-SWE (Harbor dataset). Problem The current handling of dictionary IDs during Arrow IPC serialization and deserialization is inconsistent and error‑prone. This leads to several observable issues:

The task

**Problem** The current handling of dictionary IDs during Arrow IPC serialization and deserialization is inconsistent and error‑prone. This leads to several observable issues:

Part of Lego-X/LegoFlow-SWE.