4203-6.0.6

• fix: rule optimization could silently flip all()/any() results when pruning droppable children
• fix: debounce() shared one timer across all views, causing lost re-checks when switching tabs quickly
• fix: dependency downloading could report success after failure and corrupt an existing install on a bad download
• fix: view snapshot's file_size was captured lazily instead of at snapshot time
• fix: a brand new window's first tab could miss new_file_syntax
• fix: per-window state wasn't cleared when the plugin was unloaded, leaking memory across unload/window-churn cycles