chore(strip): verwijder dubbele diagnosemodule op patientniveau

De intake-variant (intakes/[intakeId]/diagnosis) is de meest complete en
blijft. Sidebar-items Diagnose en Behandelplan (level 2) verwijderd —
behandelplan-module zelf volgt in de volgende commit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/epd/components/epd-sidebar.tsx

@@ -17,8 +17,6 @@ import {
   LayoutDashboard,
   User,
   ClipboardList,
-  Stethoscope,
-  Calendar,
   FileBarChart,
   PenLine,
   Zap
@@ -70,8 +68,6 @@ const level2NavigationItems: NavigationItem[] = [
   { id: "basisgegevens", name: "Basisgegevens", icon: User, href: "/basisgegevens" },
   { id: "screening", name: "Screening", icon: ClipboardList, href: "/screening" },
   { id: "intake", name: "Intake", icon: FileText, href: "/intakes" },
-  { id: "diagnose", name: "Diagnose", icon: Stethoscope, href: "/diagnose" },
-  { id: "behandelplan", name: "Behandelplan", icon: Calendar, href: "/behandelplan" },
   { id: "rapportage", name: "Rapportage", icon: FileBarChart, href: "/rapportage" },
 ];