feat: Remove thinking tasks after completion

[awtkns]

Ensures that we only ever show one thinking task at once. Should also mean we are not saving them in the db now. Will do a serverside followup later :)

(i have millions of thinking tasks i want to clean from db)

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[awtkns]

cc @Jshen123 as this is my first time with zustand

[awtkns]

Seems like it would be good at add a thinking message after task creation to. eg;

This can come later though. @asim-shrestha please feel free to merge this if you think it is good.

[asim-shrestha]

There should be thinking steps in between, I suspect this is removing them before they display