0.2.36: Investor View carries exit status + grey out fully-exited fund cards

The admin read-only Investor View built capital-account responses
without exited_on, so an exited position showed the active card with
$0s (the LP's own portal was correct). Extracted exit_dates() into
capital_account_router and stamp it in investor_view too; regression
test added. A fund card where every position is exited now renders
greyed (bg + title) so it reads as closed at a glance.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/ten31portal/routers/user_router.py

@@ -144,9 +144,14 @@ def investor_view(
                 col(User.id).in_({r.investor_user_id for r in cap_rows})
             )
         ).all()) if cap_rows else {}
+        # Mirror the investor's own portal exactly — including exit status, so an exited
+        # position shows its badge here too instead of a phantom -100%.
+        from ten31portal.routers.capital_account_router import exit_dates
+        exits = exit_dates(session, cap_rows)
         for r in cap_rows:
             d = CapitalAccountResponse.model_validate(r, from_attributes=True)
             d.investor_name = names.get(r.investor_user_id)
+            d.exited_on = exits.get((r.investor_user_id, r.entity_id))
             caps.append(d)
 
         doc_rows = session.exec(