Integrate comprehensive dimension calculation logic

Created complete business logic system for door dimensions:

**New: lib/calculations.ts**
- calculateHoleWidth: Total wall opening needed
- calculateHoleMinWidth/MaxWidth: Dynamic limits based on config
- calculateSidePanelWidth: Side panel sizing logic
- calculateDoorLeafWidth: Individual door panel width
- validateDimensions: Real-time validation
- Constants: Frame profiles (80mm), min/max widths

**Enhanced: lib/store.ts**
- Added doorConfig: 'enkele' | 'dubbele' (single/double door)
- Added sidePanel: 'geen' | 'links' | 'rechts' | 'beide'
- Calculated fields: holeWidth, doorLeafWidth, sidePanelWidth, min/maxWidth
- Auto-recalculation on config changes
- setWidth/setHeight with automatic clamping to valid ranges
- Internal recalculate() method updates all derived values

**Redesigned: step-dimensions.tsx**
- Door configuration selector (enkele/dubbele)
- Side panel selector (geen/links/rechts/beide)
- Width slider with dynamic min/max based on configuration
- Height slider (1800-3000mm)
- Real-time input fields synced with sliders
- Summary panel showing:
  - Door leaf width
  - Total wall opening (hole width × height)
  - Side panel width (when applicable)
- Premium tile-based UI (Dark Green/Pistachio theme)

**Added: components/ui/slider.tsx**
- Shadcn Slider component for smooth value selection

**Connected: door-3d.tsx**
- Door now uses doorLeafWidth from store (in mm, converted to meters)
- Door height from store (in mm, converted to meters)
- 3D door resizes in real-time as user drags sliders
- Maintains realistic proportions

**User Flow:**
1. User selects enkele/dubbele configuration
2. User selects side panels (if any)
3. Store calculates valid min/max widths
4. User drags width slider (clamped to valid range)
5. Store calculates door leaf width and side panel widths
6. 3D door updates instantly to show new dimensions
7. Summary shows all calculated dimensions

**Result:** Professional dimension configurator with real business logic,
          automatic validation, and real-time 3D preview

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

components/offerte/step-dimensions.tsx

@@ -1,61 +1,203 @@
 "use client";
 
-import { useFormContext } from "@/components/offerte/form-context";
+import { useConfiguratorStore } from "@/lib/store";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
-import { Ruler } from "lucide-react";
+import { Slider } from "@/components/ui/slider";
+import { Check } from "lucide-react";
 
 export function StepDimensions() {
-  const { formData, updateData } = useFormContext();
+  const {
+    doorConfig,
+    sidePanel,
+    width,
+    height,
+    minWidth,
+    maxWidth,
+    holeWidth,
+    doorLeafWidth,
+    sidePanelWidth,
+    setDoorConfig,
+    setSidePanel,
+    setWidth,
+    setHeight,
+  } = useConfiguratorStore();
 
   return (
-    <div>
-      <h2 className="mb-2 text-xl font-semibold">Afmetingen</h2>
-      <p className="mb-6 text-sm text-muted-foreground">
-        Voer de gewenste afmetingen in millimeters in.
-      </p>
+    <div className="space-y-8">
+      {/* Door Configuration */}
+      <div>
+        <h2 className="mb-2 text-lg font-bold text-[#1A2E2E]">Deur Configuratie</h2>
+        <p className="mb-4 text-sm text-gray-600">
+          Kies tussen enkele of dubbele deur.
+        </p>
 
-      <div className="grid gap-6 sm:grid-cols-2">
-        <div className="space-y-2">
-          <Label htmlFor="height" className="flex items-center gap-2">
-            <Ruler className="size-4 text-brand-orange" />
-            Hoogte (mm)
-          </Label>
-          <Input
-            id="height"
-            type="number"
-            placeholder="bijv. 2400"
-            value={formData.height ?? ""}
-            onChange={(e) => {
-              const val = e.target.value;
-              updateData({ height: val === "" ? undefined : Number(val) });
-            }}
-            className="h-12 text-lg focus-visible:ring-brand-orange"
-          />
-          <p className="text-xs text-muted-foreground">
-            Min: 2000mm &mdash; Max: 3000mm
-          </p>
+        <div className="grid gap-3 sm:grid-cols-2">
+          {(['enkele', 'dubbele'] as const).map((config) => {
+            const selected = doorConfig === config;
+
+            return (
+              <button
+                key={config}
+                type="button"
+                onClick={() => setDoorConfig(config)}
+                className={`rounded-xl border-2 p-4 text-left transition-all ${
+                  selected
+                    ? "border-[#C4D668] bg-[#1A2E2E] text-white"
+                    : "border-gray-200 bg-white text-gray-900 hover:border-[#1A2E2E]/30"
+                }`}
+              >
+                <div className="flex items-center justify-between">
+                  <div className="flex-1">
+                    <h3 className="font-bold capitalize">{config} deur</h3>
+                    <p
+                      className={`mt-1 text-sm ${
+                        selected ? "text-white/80" : "text-gray-500"
+                      }`}
+                    >
+                      {config === 'enkele' ? '1 deurblad' : '2 deurbladen'}
+                    </p>
+                  </div>
+                  {selected && (
+                    <div className="flex size-6 items-center justify-center rounded-full bg-[#C4D668]">
+                      <Check className="size-4 text-[#1A2E2E]" />
+                    </div>
+                  )}
+                </div>
+              </button>
+            );
+          })}
         </div>
+      </div>
 
-        <div className="space-y-2">
-          <Label htmlFor="width" className="flex items-center gap-2">
-            <Ruler className="size-4 rotate-90 text-brand-orange" />
-            Breedte (mm)
-          </Label>
+      {/* Side Panel Configuration */}
+      <div>
+        <h2 className="mb-2 text-lg font-bold text-[#1A2E2E]">Zijpanelen</h2>
+        <p className="mb-4 text-sm text-gray-600">
+          Voeg vaste panelen toe naast de deur.
+        </p>
+
+        <div className="grid gap-3 sm:grid-cols-2">
+          {(['geen', 'links', 'rechts', 'beide'] as const).map((panel) => {
+            const selected = sidePanel === panel;
+
+            return (
+              <button
+                key={panel}
+                type="button"
+                onClick={() => setSidePanel(panel)}
+                className={`rounded-xl border-2 p-4 text-left transition-all ${
+                  selected
+                    ? "border-[#C4D668] bg-[#1A2E2E] text-white"
+                    : "border-gray-200 bg-white text-gray-900 hover:border-[#1A2E2E]/30"
+                }`}
+              >
+                <div className="flex items-center justify-between">
+                  <div className="flex-1">
+                    <h3 className="font-bold capitalize">{panel}</h3>
+                    {panel !== 'geen' && sidePanelWidth > 0 && (
+                      <p
+                        className={`mt-1 text-sm ${
+                          selected ? "text-white/80" : "text-gray-500"
+                        }`}
+                      >
+                        {Math.round(sidePanelWidth)}mm breed
+                      </p>
+                    )}
+                  </div>
+                  {selected && (
+                    <div className="flex size-6 items-center justify-center rounded-full bg-[#C4D668]">
+                      <Check className="size-4 text-[#1A2E2E]" />
+                    </div>
+                  )}
+                </div>
+              </button>
+            );
+          })}
+        </div>
+      </div>
+
+      {/* Width Control */}
+      <div>
+        <div className="mb-4 flex items-end justify-between">
+          <div>
+            <Label className="text-base font-bold text-[#1A2E2E]">
+              Breedte
+            </Label>
+            <p className="text-sm text-gray-600">
+              {minWidth}mm - {maxWidth}mm
+            </p>
+          </div>
+          <div className="text-right">
+            <Input
+              type="number"
+              value={width}
+              onChange={(e) => setWidth(Number(e.target.value))}
+              min={minWidth}
+              max={maxWidth}
+              className="h-10 w-32 text-right font-mono text-lg font-bold"
+            />
+            <p className="mt-1 text-xs text-gray-500">Deurblad: {Math.round(doorLeafWidth)}mm</p>
+          </div>
+        </div>
+        <Slider
+          value={[width]}
+          onValueChange={(values) => setWidth(values[0])}
+          min={minWidth}
+          max={maxWidth}
+          step={10}
+          className="w-full"
+        />
+      </div>
+
+      {/* Height Control */}
+      <div>
+        <div className="mb-4 flex items-end justify-between">
+          <div>
+            <Label className="text-base font-bold text-[#1A2E2E]">
+              Hoogte
+            </Label>
+            <p className="text-sm text-gray-600">1800mm - 3000mm</p>
+          </div>
           <Input
-            id="width"
             type="number"
-            placeholder="bijv. 900"
-            value={formData.width ?? ""}
-            onChange={(e) => {
-              const val = e.target.value;
-              updateData({ width: val === "" ? undefined : Number(val) });
-            }}
-            className="h-12 text-lg focus-visible:ring-brand-orange"
+            value={height}
+            onChange={(e) => setHeight(Number(e.target.value))}
+            min={1800}
+            max={3000}
+            className="h-10 w-32 text-right font-mono text-lg font-bold"
           />
-          <p className="text-xs text-muted-foreground">
-            Min: 300mm &mdash; Max: 3000mm
+        </div>
+        <Slider
+          value={[height]}
+          onValueChange={(values) => setHeight(values[0])}
+          min={1800}
+          max={3000}
+          step={10}
+          className="w-full"
+        />
+      </div>
+
+      {/* Summary */}
+      <div className="rounded-xl bg-slate-50 p-4">
+        <h3 className="mb-2 text-sm font-bold text-[#1A2E2E]">
+          Samenvatting afmetingen
+        </h3>
+        <div className="space-y-1 text-sm text-gray-600">
+          <p>
+            <span className="font-medium">Deurblad breedte:</span>{" "}
+            {Math.round(doorLeafWidth)}mm
           </p>
+          <p>
+            <span className="font-medium">Totale wandopening:</span>{" "}
+            {Math.round(holeWidth)}mm × {height}mm
+          </p>
+          {sidePanelWidth > 0 && (
+            <p>
+              <span className="font-medium">Zijpaneel breedte:</span>{" "}
+              {Math.round(sidePanelWidth)}mm
+            </p>
+          )}
         </div>
       </div>
     </div>