chat overlay message search filter
Per conversation: The original estimate of this function assumed the old design of message list which provided some built-in (though inefficient) filtering. Given the new design we no longer want to that route. As such searchng requires the following:
Update libcwtch-go with a search function that takes in a profile and a handle and outputs a stream of results
progress(tagged to allow progress bar in the UI)
Update message view to have a search bar (like context list), which provide a drop-down list of results that can be clicked (which uses scrollcontroller to jump to the lists
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