Add visit placement on care units and beds.

Patients can be admitted, transferred, and discharged from unit/bed stays with occupancy sync, so MAR and ward boards have inpatient context.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/Visit.php

@@ -24,6 +24,7 @@ class Visit extends Model
 
     protected $fillable = [
         'uuid', 'owner_ref', 'organization_id', 'branch_id', 'patient_id',
+        'care_unit_id', 'bed_id', 'placed_at', 'placed_by',
         'status', 'specialty_stage', 'checked_in_at', 'completed_at', 'checked_in_by',
     ];
 
@@ -32,6 +33,7 @@ class Visit extends Model
         return [
             'checked_in_at' => 'datetime',
             'completed_at' => 'datetime',
+            'placed_at' => 'datetime',
         ];
     }
 
@@ -64,6 +66,30 @@ class Visit extends Model
         return $this->belongsTo(Organization::class, 'organization_id');
     }
 
+    public function careUnit(): BelongsTo
+    {
+        return $this->belongsTo(CareUnit::class, 'care_unit_id');
+    }
+
+    public function bed(): BelongsTo
+    {
+        return $this->belongsTo(Bed::class, 'bed_id');
+    }
+
+    public function bedStays(): HasMany
+    {
+        return $this->hasMany(BedStay::class, 'visit_id');
+    }
+
+    public function activeBedStay(): HasOne
+    {
+        return $this->hasOne(BedStay::class, 'visit_id')
+            ->ofMany(
+                ['id' => 'max'],
+                fn ($query) => $query->where('status', BedStay::STATUS_ACTIVE),
+            );
+    }
+
     public function appointment(): HasOne
     {
         return $this->hasOne(Appointment::class, 'visit_id');