Fixed:
- Final Safety Sweep: 12 remaining force unwraps eliminated (AgentExecutionService, BriefingEngine, CostTracker, HybridConnectionManager, QuickConnectManager, SSHStreamingExecutor, and 6 more).
- Unsafe Cast Hardening: 10 adapter/view casts changed to safe casts with fallbacks (AgentViewerAdapter, InlineModelAdapter, MediaGalleryAdapter, ChatActivity, ToolChain, NoteFilterDialog, and 4 more)....