🔧 Dashboard Productize: Documentation and code quality

[lpgarzonr]

Description

Create comprehensive documentation for the dashboard component and address code quality items, bringing it to the standard set by declarative-table-card and other shipped components.

Acceptance Criteria

Documentation

• A docs/dashboard.md is created following the established format (see docs/declarative-table.md), containing:
  • Component description and purpose
  • Tag table (Angular <mfp-dashboard> / Web Component <mfp-wc-dashboard>)
  • Full property reference with types, defaults, and descriptions for config, sections, cards, availableCards
  • Full event reference with payload descriptions for saved
  • Model reference: DashboardConfig, CardConfig, SectionConfig interfaces with all fields documented
  • Usage example as a web component (HTML + JS)
  • Usage example as an Angular component (template + TypeScript)
• The README.md component table is updated to include the dashboard

Code quality

• No TODO, FIXME, or HACK comments left in the dashboard code
• All public API types (CardConfig, SectionConfig, DashboardConfig) are documented describing each field, consider using JSDoc
• Build succeeds: npm run build:ngx && npm run build:wc
• Lint passes: npm run lint