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Flatten the message action-row component builders

Flatten the message action-row component builders: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). Building a message action row today is clumsy: to add a button or select menu you get back a separate sub-builder and then have to remember to call a finalising method on it to…

The task

Building a message action row today is clumsy: to add a button or select menu you get back a separate sub-builder and then have to remember to call a finalising method on it to actually attach the component to the row. This breaks call chaining and is easy to get wrong. Make…

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.