feat: wire remaining PostHog events across all key user actions (#111)
- export_generated: session copy, copy-for-ticket, download
- ai_feature_used: copilot, assistant chat, session-to-flow, KB accelerator, flow assist
- psa_connected: ConnectWise integration creation
- session_shared: share link creation
- flow_created: troubleshooting editor, procedural editor, session-to-flow
All 9 events from the product analytics plan are now fully wired.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>