llm-council_mod

Add model set saving and remove buttons for Council and Persona Compare modes

Add cost tracking, progress bar, and centralized settings tab

Improve error handling and rate limiting for model queries

Fix black screen issue when receiving responses - Remove immediate conversation reload after completion - Add null safety checks for conversation and messages - Preserve local conversation state during reloads - Add validation to prevent setting invalid conversation state

Add message/conversation deletion, individual stage retry, settings panel, timestamps, and cost tracking