Add nonlocal declarations for _u16_a, _u16_b, _i32 in nested functions _blend_u16 and _apply_corrections — Python treats augmented assignments (*=, +=, >>=) as local variable bindings, causing UnboundLocalError that prevented any frames from being sent to devices. Move 🔢 emoji from brightness source label to dropdown option items. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>