feat: ConnectWise PSA integration (#106)

PSA abstraction layer with provider pattern, ConnectWise integration (connection management, ticket linking, note posting, status updates, member mapping), Integrations page UI, Fernet credential encryption, in-memory TTL cache, 6 DB migrations, ConnectWise API reference docs.

frontend/src/pages/TreeNavigationPage.tsx

@@ -22,6 +22,11 @@ import { buildSessionShareUrl, getLatestActiveShareForSession } from '@/lib/sess
 import { CopilotPanel } from '@/components/copilot/CopilotPanel'
 import { CopilotToggle } from '@/components/copilot/CopilotToggle'
 import { Button } from '@/components/ui/Button'
+import { integrationsApi, sessionPsaApi } from '@/api/integrations'
+import { TicketPickerModal } from '@/components/session/TicketPickerModal'
+import { TicketLinkIndicator } from '@/components/session/TicketLinkIndicator'
+import { UpdateTicketModal } from '@/components/session/UpdateTicketModal'
+import type { PSATicketInfo } from '@/types/integrations'
 
 interface LocationState {
   sessionId?: string
@@ -65,6 +70,12 @@ export function TreeNavigationPage() {
   const sharePopoverRef = useRef<HTMLDivElement>(null)
   const [copilotOpen, setCopilotOpen] = useState(false)
 
+  // PSA ticket link state
+  const [hasConnection, setHasConnection] = useState(false)
+  const [showTicketPicker, setShowTicketPicker] = useState(false)
+  const [showUpdateModal, setShowUpdateModal] = useState(false)
+  const [ticketInfo, setTicketInfo] = useState<PSATicketInfo | null>(null)
+
   const handleCopyCommand = (text: string) => {
     navigator.clipboard.writeText(text)
     setCopiedCommand(text)
@@ -272,6 +283,32 @@ export function TreeNavigationPage() {
     }
   }, [treeId])
 
+  // Check for PSA connection on mount
+  useEffect(() => {
+    integrationsApi.getConnection()
+      .then((conn) => setHasConnection(!!conn))
+      .catch(() => setHasConnection(false))
+  }, [])
+
+  const handleTicketLinked = (linkedTicketId: string, ticket: PSATicketInfo) => {
+    setTicketInfo(ticket)
+    setSession((prev) => prev ? { ...prev, psa_ticket_id: linkedTicketId } : prev)
+    setShowTicketPicker(false)
+    toast.success(`Linked to CW #${linkedTicketId}`)
+  }
+
+  const handleTicketUnlink = async () => {
+    if (!session) return
+    try {
+      await sessionPsaApi.linkTicket(session.id, null)
+      setSession((prev) => prev ? { ...prev, psa_ticket_id: null } : prev)
+      setTicketInfo(null)
+      toast.success('Ticket unlinked')
+    } catch {
+      toast.error('Failed to unlink ticket')
+    }
+  }
+
   const loadTreeAndSession = async () => {
     setIsLoading(true)
     setError(null)
@@ -656,6 +693,16 @@ export function TreeNavigationPage() {
               {clientName && `Client: ${clientName}`}
             </p>
           )}
+          {session && (
+            <TicketLinkIndicator
+              session={session}
+              hasConnection={hasConnection}
+              onLinkClick={() => setShowTicketPicker(true)}
+              onUnlink={handleTicketUnlink}
+              onUpdateClick={session.psa_ticket_id ? () => setShowUpdateModal(true) : undefined}
+              ticketInfo={ticketInfo}
+            />
+          )}
         </div>
         <div className="flex items-center gap-2">
           {/* Share Progress Popover */}
@@ -1251,6 +1298,23 @@ export function TreeNavigationPage() {
           onClose={() => setShowShareModal(false)}
         />
       )}
+
+      {/* Ticket Picker Modal */}
+      {session && (
+        <TicketPickerModal
+          open={showTicketPicker}
+          onClose={() => setShowTicketPicker(false)}
+          sessionId={session.id}
+          onLinked={handleTicketLinked}
+        />
+      )}
+      {session && (
+        <UpdateTicketModal
+          open={showUpdateModal}
+          onClose={() => setShowUpdateModal(false)}
+          sessionId={session.id}
+        />
+      )}
       </div>
       </div>