diff --git a/dist/index.html b/dist/index.html
index 5a46227..67732ff 100644
--- a/dist/index.html
+++ b/dist/index.html
@@ -5,7 +5,7 @@
     <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>furniture-app</title>
-    <script type="module" crossorigin src="/assets/index-BP-dLhBi.js"></script>
+    <script type="module" crossorigin src="/assets/index-DE7tP3Fy.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-9k24Ci9h.css">
   </head>
   <body>
diff --git a/src/ai/nn.ts b/src/ai/nn.ts
index d5fcb2e..5402894 100644
--- a/src/ai/nn.ts
+++ b/src/ai/nn.ts
@@ -16,6 +16,11 @@ export function optimizeWithNN(state: LayoutState, options: NNOptions = {}): { b
       ...f,
       shape: { ...f.shape, points: f.shape.points?.map((p) => ({ ...p })) },
     })),
+    presets: state.presets?.map((p) => ({
+      ...p,
+      shape: { ...p.shape },
+      conditions: p.conditions.map((c) => ({ ...c, params: { ...(c.params || {}) } })),
+    })),
   };
 
   const entrance = candidate.entrance;
diff --git a/src/components/ControlPanel.tsx b/src/components/ControlPanel.tsx
index 565131c..c031499 100644
--- a/src/components/ControlPanel.tsx
+++ b/src/components/ControlPanel.tsx
@@ -308,23 +308,11 @@ export function ControlPanel({
               <div className="grid-2">
                 <label className="field">
                   <span>Width</span>
-                  <NumberField
-                    value={state.room.width}
-                    min={100}
-                    max={5000}
-                    width="100%"
-                    onChange={(v) => setRoom({ width: v })}
-                  />
+                  <NumberField value={state.room.width} min={100} width="100%" onChange={(v) => setRoom({ width: v })} />
                 </label>
                 <label className="field">
                   <span>Height</span>
-                  <NumberField
-                    value={state.room.height}
-                    min={100}
-                    max={5000}
-                    width="100%"
-                    onChange={(v) => setRoom({ height: v })}
-                  />
+                  <NumberField value={state.room.height} min={100} width="100%" onChange={(v) => setRoom({ height: v })} />
                 </label>
               </div>
             </div>
diff --git a/src/components/RoomCanvas.tsx b/src/components/RoomCanvas.tsx
index bbe3651..75986ad 100644
--- a/src/components/RoomCanvas.tsx
+++ b/src/components/RoomCanvas.tsx
@@ -33,38 +33,6 @@ export function RoomCanvas({ state, onStateChange, mode, selectedId, onSelect, s
     return () => clearInterval(t);
   }, [showPaths]);
 
-  const [viewport, setViewport] = useState({ width: 1200, height: 800 });
-  const containerRef = useRef<HTMLDivElement>(null);
-
-  useEffect(() => {
-    const resize = () => {
-      if (containerRef.current) {
-        setViewport({
-          width: Math.floor(containerRef.current.clientWidth),
-          height: Math.floor(containerRef.current.clientHeight),
-        });
-      }
-    };
-    resize();
-    window.addEventListener('resize', resize);
-    return () => window.removeEventListener('resize', resize);
-  }, []);
-
-  useEffect(() => {
-    const canvas = canvasRef.current;
-    if (!canvas) return;
-    const dpr = Math.max(1, window.devicePixelRatio || 1);
-    const baseW = Math.min(state.room.width, viewport.width || state.room.width);
-    const baseH = Math.min(state.room.height, viewport.height || state.room.height);
-    canvas.style.width = `${baseW}px`;
-    canvas.style.height = `${baseH}px`;
-    canvas.width = baseW * dpr;
-    canvas.height = baseH * dpr;
-    const ctx = canvas.getContext('2d');
-    if (ctx) ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
-    draw();
-  }, [state.room.width, state.room.height, zoom, viewport]);
-
   useEffect(() => {
     draw();
   }, [state, selectedId, mode, zoom, showPaths, phase]);
@@ -74,14 +42,9 @@ export function RoomCanvas({ state, onStateChange, mode, selectedId, onSelect, s
     if (!canvas) return;
     const ctx = canvas.getContext('2d');
     if (!ctx) return;
-    const dpr = Math.max(1, window.devicePixelRatio || 1);
-    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
-    ctx.clearRect(0, 0, canvas.width / dpr, canvas.height / dpr);
+    ctx.clearRect(0, 0, canvas.width, canvas.height);
     ctx.save();
-    const scaleX = (canvas.width / dpr) / state.room.width;
-    const scaleY = (canvas.height / dpr) / state.room.height;
-    const s = Math.min(scaleX, scaleY);
-    ctx.scale(s, s);
+    ctx.scale(zoom, zoom);
 
     ctx.fillStyle = '#12151b';
     ctx.fillRect(0, 0, state.room.width, state.room.height);
@@ -90,21 +53,16 @@ export function RoomCanvas({ state, onStateChange, mode, selectedId, onSelect, s
     ctx.strokeStyle = 'rgba(255,255,255,0.035)';
     ctx.lineWidth = 1;
     const step = 25;
-    const maxLines = 2000;
-    const xCount = Math.min(Math.floor(state.room.width / step) + 1, maxLines);
-    const yCount = Math.min(Math.floor(state.room.height / step) + 1, maxLines);
-    for (let i = 0; i < xCount; i++) {
-      const x = i * step;
+    for (let x = 0; x <= state.room.width; x += step) {
       ctx.beginPath();
       ctx.moveTo(x, 0);
-      ctx.lineTo(x, Math.min(state.room.height, step * yCount));
+      ctx.lineTo(x, state.room.height);
       ctx.stroke();
     }
-    for (let i = 0; i < yCount; i++) {
-      const y = i * step;
+    for (let y = 0; y <= state.room.height; y += step) {
       ctx.beginPath();
       ctx.moveTo(0, y);
-      ctx.lineTo(Math.min(state.room.width, step * xCount), y);
+      ctx.lineTo(state.room.width, y);
       ctx.stroke();
     }
 
@@ -350,19 +308,17 @@ export function RoomCanvas({ state, onStateChange, mode, selectedId, onSelect, s
   };
 
   return (
-    <div ref={containerRef} style={{ width: '100%', height: '100%' }}>
-      <canvas
-        ref={canvasRef}
-        width={Math.min(state.room.width, 2000)}
-        height={Math.min(state.room.height, 2000)}
-        style={{ maxWidth: '100%', maxHeight: '100%', width: '100%', height: '100%', objectFit: 'contain' }}
-        onMouseDown={handleMouseDown}
-        onMouseMove={handleMouseMove}
-        onMouseUp={handleMouseUp}
-        onDragOver={handleDragOver}
-        onDrop={handleDrop}
-      />
-    </div>
+    <canvas
+      ref={canvasRef}
+      width={Math.max(state.room.width, 400)}
+      height={Math.max(state.room.height, 300)}
+      style={{ maxWidth: '100%', height: 'auto' }}
+      onMouseDown={handleMouseDown}
+      onMouseMove={handleMouseMove}
+      onMouseUp={handleMouseUp}
+      onDragOver={handleDragOver}
+      onDrop={handleDrop}
+    />
   );
 }
 
diff --git a/src/geometry/collision.ts b/src/geometry/collision.ts
index b607c03..ca96eed 100644
--- a/src/geometry/collision.ts
+++ b/src/geometry/collision.ts
@@ -35,8 +35,7 @@ export function colliderCorners(c: Collider): Point[] {
 function project(points: Point[], axis: Point): [number, number] {
   let min = Infinity;
   let max = -Infinity;
-  for (let i = 0; i < points.length; i++) {
-    const p = points[i];
+  for (const p of points) {
     const d = p.x * axis.x + p.y * axis.y;
     if (d < min) min = d;
     if (d > max) max = d;
diff --git a/src/optimization/randomSearch.ts b/src/optimization/randomSearch.ts
index 03080ae..b00b310 100644
--- a/src/optimization/randomSearch.ts
+++ b/src/optimization/randomSearch.ts
@@ -48,5 +48,6 @@ function cloneState(state: LayoutState): LayoutState {
     room: { ...state.room },
     entrance: state.entrance ? { ...state.entrance } : null,
     furniture: state.furniture.map((f) => new Furniture(f).toConfig()),
+    presets: state.presets?.map((p) => ({ ...p, shape: { ...p.shape }, conditions: p.conditions.map((c) => ({ ...c, params: { ...(c.params || {}) } })) })),
   };
 }