feat: mejorar UI con Vuetify 3, POS tipo venta real, dashboard

openspec/changes/improve-ui-ux-pos/design.md

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+# Design: improve-ui-ux-pos
+
+## UI Library
+Use Vuetify 3 with Material Design 3, responsive for tablet.
+
+## POS Flow
+- Product grid by category/producer
+- Cart with quantities
+- Payment method selection
+- Quick sale completion
+
+## UX Improvements
+- Dashboard with day summary
+- Guided setup on first run
+- Data tables for all entities
+- Better forms with validation
+- Consistent theming
+
+## Testing
+Playwright tests for web UI covering realistic scenarios