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>

frontend/src/pages/SessionDetailPage.tsx

@@ -8,6 +8,7 @@ import { treesApi } from '@/api/trees'
 import { sessionToFlowApi } from '@/api/sessionToFlow'
 import { ExportPreviewModal } from '@/components/session/ExportPreviewModal'
 import { SaveSessionAsTreeModal } from '@/components/session/SaveSessionAsTreeModal'
+import { analytics } from '@/lib/analytics'
 import { ShareSessionModal } from '@/components/session/ShareSessionModal'
 import { SessionOutcomeModal } from '@/components/session/SessionOutcomeModal'
 import { SessionTimeline } from '@/components/session/SessionTimeline'
@@ -150,6 +151,7 @@ export function SessionDetailPage() {
         setCopied(true)
         setTimeout(() => setCopied(false), 2000)
         toast.success('Copied to clipboard')
+        analytics.exportGenerated({ session_id: session?.id || '', format: exportFormat })
       }
     } catch (err) {
       console.error('Copy failed:', err)
@@ -168,6 +170,7 @@ export function SessionDetailPage() {
         setCopiedPsa(true)
         setTimeout(() => setCopiedPsa(false), 2000)
         toast.success('Copied ticket notes to clipboard')
+        analytics.exportGenerated({ session_id: session.id, format: 'psa' })
       }
     } catch (err) {
       console.error('Copy for ticket failed:', err)
@@ -177,6 +180,7 @@ export function SessionDetailPage() {
 
   const handleDownload = (content: string) => {
     if (!session) return
+    analytics.exportGenerated({ session_id: session.id, format: exportFormat })
     const blob = new Blob([content], { type: 'text/plain' })
     const url = URL.createObjectURL(blob)
     const a = document.createElement('a')
@@ -256,6 +260,7 @@ export function SessionDetailPage() {
     setIsGeneratingFlow(true)
     try {
       const flowData = await sessionToFlowApi.generate(session.id)
+      analytics.aiFeatureUsed({ feature: 'session_to_flow' })
       const tree = await treesApi.create({
         name: flowData.name,
         description: flowData.description,
@@ -264,6 +269,7 @@ export function SessionDetailPage() {
         tags: flowData.tags,
       })
       toast.success('Flow generated! Opening editor...')
+      analytics.flowCreated({ flow_type: 'procedural', method: 'session_to_flow' })
       navigate(getTreeEditorPath(tree.id, 'procedural'))
     } catch (err) {
       console.error('Failed to generate flow from session:', err)