Release v1.42.2

➞ Refine chat whisper references
➞ feat(chat): consolidate whisper and mention styling
➞ feat(chat): reuse picker for experiment flags
➞ fix(chat): align styling cache and controls
➞ fix(chat): refine composer and whisper styles
➞ Refine whisper composer and deployment assets
➞ Gate legacy whispers by chat experience
➞ Add staging deployment approval gate
➞ Refine whisper recipient picker
➞ Ignore generated runtime assets
➞ Ignore local planning and build output
➞ Optimize recipient picker lookups
➞ fix(chat): align mobile composer inset
➞ perf(chat): warm recipient picker candidates
➞ fix(chat): preserve bubble theme and whisper target
➞ fix(chat): preserve outgoing bubble geometry
➞ fix(chat): restore responsive bubble width
➞ Fix whisper reply authorization and state reset