feat: unify sharing modal and clean up team share duplication in lists

frontend/src/lib/types.ts

@@ -243,6 +243,18 @@ export interface SpaceMember {
   joinedAt: string;
 }
 
+export interface UnifiedShare {
+  id: string;
+  targetType: 'team' | 'user';
+  targetId: string;
+  targetName?: string;
+  targetEmail?: string;
+  permission?: 'editor' | 'viewer';
+  role?: string;
+  createdBy?: string;
+  createdAt: string;
+}
+
 export interface SpaceShare {
   id: string;
   spaceId: string;