v0.1-sprint0: Esqueleto completo AR-ShipDesign

- Estructura completa de carpetas (236 módulos stub + implementados)
- pyproject.toml, requirements, .gitignore, LICENSE (propietario)
- core/project.py: serialización .arsd (ZIP con JSON)
- core/units.py: conversiones SI <-> imperial completas
- ui/main_window.py: layout DELFTship-style con todos los paneles
  - Árbol de proyecto (dock izquierda)
  - Tabs de módulos (centro)
  - Panel de propiedades (dock derecha)
  - Panel hidrostáticos en vivo (inferior, fijo)
- ui/i18n: español e inglés
- ui/themes: tema claro y oscuro
- utils/logger.py, settings.py, validation.py
- data/liquids.json: 15 líquidos navales
- data/stability_criteria.json: IMO IS Code 2008, A.749(18), USCG
- tests/test_startup.py: 12 tests, todos PASSED
- Módulo scantling/ ISO 12215 (stubs Sprint 2.5)
- Módulo fabrication/molds/ para moldes FRP (stubs Sprint 13B)
- Módulo fabrication/ para CNC plasma/router/laser (stubs Sprint 13)

arshipdesign/ui/themes/light.qss

@@ -0,0 +1,49 @@
+/* AR-ShipDesign — Tema Claro */
+
+QMainWindow, QDialog, QWidget {
+    background-color: #f5f5f5;
+    color: #212121;
+    font-family: "Segoe UI", Arial, sans-serif;
+    font-size: 13px;
+}
+
+QMenuBar { background-color: #ffffff; color: #212121; border-bottom: 1px solid #e0e0e0; }
+QMenuBar::item:selected { background-color: #e3f2fd; }
+QMenu { background-color: #ffffff; color: #212121; border: 1px solid #e0e0e0; }
+QMenu::item:selected { background-color: #1976d2; color: #ffffff; }
+
+QToolBar { background-color: #ffffff; border-bottom: 1px solid #e0e0e0; }
+QToolButton { background: transparent; border: 1px solid transparent; border-radius: 3px; padding: 3px; }
+QToolButton:hover { background-color: #e3f2fd; }
+QToolButton:pressed { background-color: #1976d2; color: #ffffff; }
+
+QTreeWidget, QTreeView, QListView, QTableView {
+    background-color: #ffffff;
+    alternate-background-color: #f8f9fa;
+    color: #212121;
+    border: 1px solid #e0e0e0;
+    selection-background-color: #1976d2;
+    selection-color: #ffffff;
+}
+QHeaderView::section { background-color: #f5f5f5; color: #555; border: 1px solid #e0e0e0; padding: 4px 6px; }
+
+QTabWidget::pane { border: 1px solid #e0e0e0; background-color: #ffffff; }
+QTabBar::tab { background-color: #f5f5f5; color: #666; border: 1px solid #e0e0e0; border-bottom: none; padding: 5px 10px; }
+QTabBar::tab:selected { background-color: #ffffff; color: #212121; border-bottom: 2px solid #1976d2; }
+
+QPushButton { background-color: #1976d2; color: #ffffff; border: none; border-radius: 4px; padding: 6px 14px; }
+QPushButton:hover { background-color: #1e88e5; }
+QPushButton:pressed { background-color: #1565c0; }
+
+QLineEdit, QSpinBox, QDoubleSpinBox, QComboBox { background-color: #ffffff; color: #212121; border: 1px solid #bdbdbd; border-radius: 3px; padding: 4px 6px; }
+QLineEdit:focus, QSpinBox:focus, QDoubleSpinBox:focus { border-color: #1976d2; }
+
+QStatusBar { background-color: #1976d2; color: #ffffff; }
+
+#hydrostaticsPanel {
+    background-color: #e8f4fd;
+    border-top: 2px solid #1976d2;
+}
+#hydrostaticsPanel QLabel[value="true"] { color: #0277bd; font-weight: bold; }
+#hydrostaticsPanel QLabel[imo_ok="true"] { color: #2e7d32; font-weight: bold; }
+#hydrostaticsPanel QLabel[imo_fail="true"] { color: #c62828; font-weight: bold; }