This breaks a transitive dependency of `agent` on UI crates. I've also
found and eliminated some dead code in assistant_context_editor.
Release Notes:
- N/A
One caveat with this PR is that the keybinding still doesn't work for text threads. Will do that in a follow-up.
Release Notes:
- agent: Added a keybinding to toggle Burn Mode on and off.
Related discussions #30240#30596
Release Notes:
- Added the ability to use max mode on text threads.
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Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
