M5 — Full native widget set (replace magic_view)

[ajianaz]

Goal

Grow src/widgets so it can fully replace magic_view across all projects.

Tasks

• CofluiAutoComplete
• CofluiDatePicker / CofluiMonthPicker (styled dialogs)
• CofluiDialog rich variants (confirm-with-input, bottom-sheet)
• CofluiLayout — scaffold helpers (app bar, section headers)
• Theming polish: dark mode tokens, typography presets
• Migration guide: magic_view → coflui mapping table

Acceptance

• Every magic_view widget has a coflui equivalent; a project can drop magic_view.