Release 0.2.22: capital chart, Investor View, GP stakes, doc folders

Snapshot commit bringing the uncommitted phase-2 work into version control
together with four new features and the 0.2.22 version bump.

New features:
- Investor capital-over-time chart (value, paid-in, distributions per
  quarter), rendered from existing capital-account history.
- Admin Investor View: read-only reconstruction of an investor's portal
  (GET /api/users/{id}/investor-view), reusing the investor portal UI.
- Document upload scoped to the selected fund's own investors, with an
  explicit upload-target confirmation to prevent mis-attaching.
- GP/mgmt entities gain an Assets tab listing their stakes in the funds
  they manage (new entity_stakes table + /api/entities/{id}/stakes).
- Edit-entity form (change type/status/etc.), so GP entities can be
  categorized correctly.

Verified: 11/11 backend tests pass; alembic upgrades to head b8c9d0e1f2a3;
frontend tsc + vite build clean; s9pk packs at 0.2.22:0 (x86_64).
Also: ignore .DS_Store and *.s9pk artifacts.

frontend/src/api.ts

@@ -205,6 +205,25 @@ export interface AuditEntry {
   created_at: string;
 }
 
+export interface EntityStake {
+  id: number;
+  holder_entity_id: number;
+  fund_entity_id: number;
+  fund_name: string | null;
+  fund_type: EntityType | null;
+  ownership_pct: number | null;
+  value_cents: number | null;
+  note: string | null;
+  created_at: string;
+}
+
+export interface InvestorView {
+  user: User;
+  entities: Entity[];
+  capital_accounts: CapitalAccount[];
+  documents: PortalDocument[];
+}
+
 // --- API helpers ---
 
 export class ApiError extends Error {
@@ -270,6 +289,18 @@ export const api = {
   updateEntity: (id: number, data: Partial<Entity>) =>
     request<Entity>(`/api/entities/${id}`, { method: "PATCH", body: JSON.stringify(data) }),
 
+  // Entity stakes (a GP/mgmt entity's interest in the funds it manages)
+  listStakes: (entityId: number) => request<EntityStake[]>(`/api/entities/${entityId}/stakes`),
+  createStake: (
+    entityId: number,
+    data: { fund_entity_id: number; ownership_pct?: number | null; value_dollars?: number | null; note?: string | null },
+  ) => request<EntityStake>(`/api/entities/${entityId}/stakes`, { method: "POST", body: JSON.stringify(data) }),
+  deleteStake: (entityId: number, stakeId: number) =>
+    request<{ status: string }>(`/api/entities/${entityId}/stakes/${stakeId}`, { method: "DELETE" }),
+
+  // Investor View (admin read-only reconstruction of an investor's portal)
+  investorView: (userId: number) => request<InvestorView>(`/api/users/${userId}/investor-view`),
+
   // Holdings
   listHoldings: (entityId: number) =>
     request<Holding[]>(`/api/entities/${entityId}/holdings`),