feat: complete house plan maker application

Full-featured house/apartment floor plan editor with:

- Turborepo monorepo (React/Vite client, Fastify/Prisma server, shared Zod schemas)
- 2D room editor with walls, doors, windows, furniture, electrical elements
- 3D room preview with Three.js (auto-hide nearest walls, bird's eye default)
- Wall projection views with interactive drag (elevation, position)
- Apartment floor plan view with room positioning
- Copy/paste, alignment tools, measurement tool, annotations
- Item-attached annotations with leader lines (visible on projections)
- Door open direction (LEFT/RIGHT/INWARD/OUTWARD) with swing arc
- Floor type textures (wood, tile, concrete, laminate, herringbone)
- Wall color picker for 3D view
- Furniture: bed, desk, wardrobe, sofa, table, chair, shelf, nightstand, dresser, bookcase, TV (with stand toggle), AC unit
- Furniture elevation support (wall-mounted items)
- Auto-save with dirty state tracking, batch save API
- Rotation-aware collision detection (SAT/OBB) with 3D elevation check
- Rotation-aware hit testing
- i18n (English/Russian) with locale-aware number formatting
- Dark mode with system preference detection
- Undo/redo, keyboard shortcuts, scale bar
- PDF/PNG/JSON export and JSON import
- Focus trap modal, toast notifications, tooltips
- Responsive layout with overlay palettes

apps/client/src/components/editor/symbols/furniture/TvSilhouette.tsx

@@ -0,0 +1,47 @@
+import { Group, Rect, Line } from 'react-konva';
+
+interface TvSilhouetteProps {
+  readonly x: number;
+  readonly y: number;
+  readonly width: number;
+  readonly depth: number;
+  readonly rotation: number;
+  readonly color: string;
+  readonly fillColor: string;
+}
+
+/** Top-down TV silhouette: thin rectangle with screen indicator. */
+export function TvSilhouette({ x, y, width, depth, rotation, color, fillColor }: TvSilhouetteProps) {
+  const halfW = width / 2;
+  const halfD = depth / 2;
+
+  return (
+    <Group x={x} y={y} rotation={rotation}>
+      {/* TV body */}
+      <Rect
+        x={-halfW}
+        y={-halfD}
+        width={width}
+        height={depth}
+        stroke={color}
+        strokeWidth={1.5}
+        fill={fillColor}
+        listening={false}
+      />
+      {/* Screen line */}
+      <Line
+        points={[-halfW + width * 0.05, -halfD * 0.5, halfW - width * 0.05, -halfD * 0.5]}
+        stroke={color}
+        strokeWidth={1}
+        listening={false}
+      />
+      {/* Stand center mark */}
+      <Line
+        points={[0, halfD * 0.3, 0, halfD]}
+        stroke={color}
+        strokeWidth={1.5}
+        listening={false}
+      />
+    </Group>
+  );
+}