🔧 Dashboard Productize: Accessibility

[lpgarzonr]

Description

Add accessibility support to the dashboard component, ensuring keyboard navigation, screen reader compatibility, and proper ARIA labels across all interactive elements.

Acceptance Criteria

• Dashboard toolbar buttons have accessible labels (accessible-name or visible text)
• The "Add Card" dialog can be opened and dismissed with keyboard (Enter/Escape)
• Card remove buttons have accessible labels (e.g., aria-label="Remove card: {card.label}")
• Section remove buttons have accessible labels
• Tab order within the dashboard is logical (toolbar → sections → cards → edit bar)
• Build succeeds: npm run build:ngx && npm run build:wc