feat: mid-session status updates — ticket notes, client updates, email drafts

Engineers can now generate AI-powered status updates during active FlowPilot
sessions and after resolve/escalate. Three audiences (Ticket Notes, Client
Update, Email Draft) with Quick/Detailed length options. Copy to clipboard
with one click. Client names auto-inserted from intake/PSA context.

Backend: new endpoint POST /ai-sessions/{id}/status-update with audience-aware
system prompts. Frontend: StatusUpdateModal with 2-step selection flow,
Share Update button in action bar, Share Resolution/Escalation on completed
sessions. Also updates Solutions Library spec with Community tier design.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/types/ai-session.ts

@@ -128,6 +128,28 @@ export interface SessionCloseResponse {
   member_mapping_warning: string | null
 }
 
+export type StatusUpdateAudience = 'ticket_notes' | 'client_update' | 'email_draft'
+export type StatusUpdateLength = 'quick' | 'detailed'
+export type StatusUpdateContext = 'status' | 'resolution' | 'escalation'
+
+export interface StatusUpdateRequest {
+  audience: StatusUpdateAudience
+  length: StatusUpdateLength
+  context: StatusUpdateContext
+}
+
+export interface StatusUpdateResponse {
+  content: string
+  audience: StatusUpdateAudience
+  length: StatusUpdateLength
+  context: StatusUpdateContext
+  session_status: string
+  steps_completed: number
+  time_spent_display: string | null
+  client_name: string | null
+  generated_at: string
+}
+
 export interface RateSessionRequest {
   rating: number
   feedback?: string | null