Smoother scrolling; session search improved; resume no…

Scrolling feels smoother with better trackpad and wheel handling plus configurable speed and mode
Session search now returns tighter multi-word results and handles filenames and plurals better
Session picker now always searches conversation content for queries of two or more characters
Tool call grouping is now enabled by default, folding consecutive reads and searches into single rows
Plugins tab now supports u to update the selected plugin and shows non-blocking success feedback
Reasoning effort used for a session is now recorded in summary.json and conversation history
Session content search now correctly indexes messages containing escape sequences like newlines and quotes
Formatted links now keep their link color when wrapped in bold, italic, or strikethrough
Resuming sessions no longer fails permanently when history files contain corrupted lines from interrupted writes

Smoother scrolling; session search improved; resume no longer fails on corrupted history