feat(cortex): Epic 1 - Patient Sidebar (E1.S1-S4)

Collapsible overlay sidebar voor snelle patient selectie met search en recent patients.

E1.S1 - Store uitbreiding:
- recentPatients: Patient[] (max 5, nieuwste eerst, geen duplicaten)
- patientSidebarOpen: boolean
- addRecentPatient, togglePatientSidebar, setPatientSidebarOpen actions

E1.S2 - PatientSidebar component:
- Overlay sidebar (w-80, z-50) met backdrop
- Search input met debounce (200ms)
- Recent patients sectie
- Hergebruik usePatientSearch, usePatientSelection hooks
- Hergebruik PatientListItem component

E1.S3 - Toggle button + shortcut:
- Users icon button in ContextBar
- Cmd/Ctrl+P keyboard shortcut
- Escape sluit sidebar (prioriteit boven artifacts)

E1.S4 - Click-to-select flow:
- Selectie zet activePatient
- Voegt toe aan recentPatients
- Sluit sidebar automatisch

Bouwplan v1.3: Epic 1 compleet (10/23 SP - 43%)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

stores/cortex-store.ts

@@ -105,6 +105,10 @@ interface CortexStore {
   activePatient: Patient | null;
   shift: ShiftType;
 
+  // Patient sidebar (E1)
+  recentPatients: Patient[];
+  patientSidebarOpen: boolean;
+
   // Block state
   activeBlock: BlockType | null;
   prefillData: BlockPrefillData;
@@ -143,6 +147,11 @@ interface CortexStore {
   setActivePatient: (patient: Patient | null) => void;
   setShift: (shift: ShiftType) => void;
 
+  // Patient sidebar actions (E1)
+  addRecentPatient: (patient: Patient) => void;
+  togglePatientSidebar: () => void;
+  setPatientSidebarOpen: (open: boolean) => void;
+
   // Block actions (legacy - will be replaced by artifact actions)
   openBlock: (type: BlockType, prefill?: BlockPrefillData) => void;
   closeBlock: () => void;
@@ -199,6 +208,10 @@ interface CortexStore {
 const initialState = {
   activePatient: null,
   shift: getCurrentShift(),
+  // Patient sidebar (E1)
+  recentPatients: [] as Patient[],
+  patientSidebarOpen: false,
+  // Block state
   activeBlock: null,
   prefillData: {},
   isBlockLoading: false,
@@ -231,6 +244,29 @@ export const useCortexStore = create<CortexStore>()(
 
       setShift: (shift) => set({ shift }, false, 'setShift'),
 
+      // Patient sidebar actions (E1)
+      addRecentPatient: (patient) =>
+        set(
+          (state) => ({
+            recentPatients: [
+              patient,
+              ...state.recentPatients.filter((p) => p.id !== patient.id),
+            ].slice(0, 5),
+          }),
+          false,
+          'addRecentPatient'
+        ),
+
+      togglePatientSidebar: () =>
+        set(
+          (state) => ({ patientSidebarOpen: !state.patientSidebarOpen }),
+          false,
+          'togglePatientSidebar'
+        ),
+
+      setPatientSidebarOpen: (open) =>
+        set({ patientSidebarOpen: open }, false, 'setPatientSidebarOpen'),
+
       // Block actions
       openBlock: (type, prefill = {}) => {
         set(