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/properties-panel.module.css

@@ -0,0 +1,133 @@
+.panel {
+  width: 260px;
+  min-width: 260px;
+  background-color: var(--color-bg-elevated);
+  border-left: 1px solid var(--color-border);
+  overflow-y: auto;
+  flex-shrink: 0;
+}
+
+.header {
+  padding: var(--space-3) var(--space-4);
+  font-size: var(--font-size-sm);
+  font-weight: var(--font-weight-semibold);
+  color: var(--color-text-primary);
+  border-bottom: 1px solid var(--color-border);
+  letter-spacing: var(--letter-spacing-wide);
+  text-transform: uppercase;
+}
+
+.empty {
+  padding: var(--space-6) var(--space-4);
+  text-align: center;
+}
+
+.emptyText {
+  font-size: var(--font-size-sm);
+  color: var(--color-text-secondary);
+  margin-bottom: var(--space-1);
+}
+
+.emptyHint {
+  font-size: var(--font-size-xs);
+  color: var(--color-text-muted);
+}
+
+.section {
+  padding: var(--space-3) var(--space-4);
+  border-bottom: 1px solid var(--color-border);
+}
+
+.sectionTitle {
+  font-size: var(--font-size-xs);
+  font-weight: var(--font-weight-semibold);
+  color: var(--color-text-muted);
+  text-transform: uppercase;
+  letter-spacing: var(--letter-spacing-wide);
+  margin-bottom: var(--space-2);
+}
+
+.row {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: var(--space-1) 0;
+  min-height: 28px;
+}
+
+.rowLabel {
+  font-size: var(--font-size-xs);
+  color: var(--color-text-secondary);
+  flex-shrink: 0;
+}
+
+.rowValue {
+  font-size: var(--font-size-xs);
+  color: var(--color-text-primary);
+  font-variant-numeric: tabular-nums;
+  text-align: right;
+}
+
+.editableValue {
+  font-size: var(--font-size-xs);
+  color: var(--color-text-primary);
+  font-variant-numeric: tabular-nums;
+  text-align: right;
+  background: none;
+  border: none;
+  padding: var(--space-1) var(--space-1);
+  border-radius: var(--radius-sm);
+  cursor: pointer;
+  font-family: var(--font-family);
+  transition: background var(--transition-fast);
+}
+
+.editableValue:hover {
+  background-color: var(--color-bg-hover);
+}
+
+.editRow {
+  display: flex;
+  align-items: center;
+  gap: var(--space-1);
+}
+
+.editInput {
+  width: 60px;
+  padding: 2px var(--space-1);
+  border: 1px solid var(--color-accent-300);
+  border-radius: var(--radius-sm);
+  font-size: var(--font-size-xs);
+  font-family: var(--font-mono);
+  color: var(--color-text-primary);
+  text-align: right;
+  outline: none;
+  background-color: var(--color-bg-elevated);
+}
+
+.editInput:focus {
+  border-color: var(--color-accent-500);
+  box-shadow: 0 0 0 2px var(--color-focus-ring);
+}
+
+.editUnit {
+  font-size: var(--font-size-xs);
+  color: var(--color-text-muted);
+}
+
+.selectInput {
+  padding: 2px var(--space-1);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-sm);
+  font-size: var(--font-size-xs);
+  font-family: var(--font-family);
+  color: var(--color-text-primary);
+  background-color: var(--color-bg-elevated);
+  cursor: pointer;
+  outline: none;
+}
+
+.selectInput:focus {
+  border-color: var(--color-accent-500);
+  box-shadow: 0 0 0 2px var(--color-focus-ring);
+}