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.

backend/ten31portal/routers/auth_router.py

@@ -6,7 +6,7 @@ from sqlmodel import Session, select
 from ten31portal.auth import get_current_user, hash_password, verify_password
 from ten31portal.database import get_session
 from ten31portal.models import User
-from ten31portal.schemas import LoginRequest, UserResponse
+from ten31portal.schemas import ChangePasswordRequest, LoginRequest, UserResponse
 
 router = APIRouter(prefix="/api/auth", tags=["auth"])
 
@@ -17,9 +17,20 @@ def login(
     request: Request,
     session: Session = Depends(get_session),
 ) -> UserResponse:
-    user = session.exec(select(User).where(User.email == body.email)).first()
+    # Accept either a username or an email in the login field.
+    handle = body.login.strip()
+    user = session.exec(select(User).where(User.username == handle)).first()
+    if user is None:
+        user = session.exec(select(User).where(User.email == handle)).first()
     if user is None or not verify_password(body.password, user.password_hash):
-        raise HTTPException(status_code=401, detail="Invalid email or password")
+        raise HTTPException(status_code=401, detail="Invalid username or password")
+    if user.primary_account_id is not None:
+        raise HTTPException(
+            status_code=401,
+            detail="This account signs in under another login. Use that account's credentials.",
+        )
+    if not user.login_enabled:
+        raise HTTPException(status_code=401, detail="This account does not have a login yet.")
     if not user.is_active:
         raise HTTPException(status_code=401, detail="Account disabled")
     request.session["user_id"] = user.id
@@ -35,3 +46,20 @@ def logout(request: Request) -> dict[str, str]:
 @router.get("/me")
 def me(user: User = Depends(get_current_user)) -> UserResponse:
     return UserResponse.model_validate(user, from_attributes=True)
+
+
+@router.post("/change-password")
+def change_password(
+    body: ChangePasswordRequest,
+    user: User = Depends(get_current_user),
+    session: Session = Depends(get_session),
+) -> dict[str, str]:
+    """Let the signed-in user set their own password (after confirming the current one)."""
+    if not verify_password(body.current_password, user.password_hash):
+        raise HTTPException(status_code=400, detail="Current password is incorrect.")
+    if len(body.new_password) < 4:
+        raise HTTPException(status_code=400, detail="New password must be at least 4 characters.")
+    user.password_hash = hash_password(body.new_password)
+    session.add(user)
+    session.commit()
+    return {"status": "ok"}