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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-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). 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…

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.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.