feat: add session sharing types, API client, and utilities

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/api/sessions.ts

@@ -1,5 +1,5 @@
 import apiClient from './client'
-import type { Session, SessionCreate, SessionUpdate, SessionExport, SaveAsTreeRequest, SaveAsTreeResponse, SessionComplete, RedactionSummary } from '@/types'
+import type { Session, SessionCreate, SessionUpdate, SessionExport, SaveAsTreeRequest, SaveAsTreeResponse, SessionComplete, RedactionSummary, SessionShareCreate, SessionShare, SharedSessionView } from '@/types'
 
 export interface SessionListParams {
   page?: number
@@ -85,6 +85,26 @@ export const sessionsApi = {
     const response = await apiClient.post<SaveAsTreeResponse>(`/sessions/${id}/save-as-tree`, data)
     return response.data
   },
+
+  // Session Sharing
+  async createShare(sessionId: string, data: SessionShareCreate): Promise<SessionShare> {
+    const response = await apiClient.post<SessionShare>(`/sessions/${sessionId}/shares`, data)
+    return response.data
+  },
+
+  async listMyShares(): Promise<SessionShare[]> {
+    const response = await apiClient.get<SessionShare[]>('/shares/my-shares')
+    return response.data
+  },
+
+  async revokeShare(shareId: string): Promise<void> {
+    await apiClient.delete(`/shares/${shareId}`)
+  },
+
+  async getSharedSession(shareToken: string): Promise<SharedSessionView> {
+    const response = await apiClient.get<SharedSessionView>(`/share/${shareToken}`)
+    return response.data
+  },
 }
 
 export default sessionsApi