Allow form description to be rich text / HTML

[scottgrayson]

Summary

Enables the form Description field to store and display rich text/HTML instead of plain text.

Changes

• FilamentFormResource: Replaced Textarea::make('description') with RichEditor::make('description') so admins can use bold, lists, links, etc.
• show.blade.php: Render description as HTML with {!! ... !!} inside a conditional block with prose styling. Content is admin-controlled.
• No migration; existing text column is sufficient (~64 KB).

Testing

• Edit a form in admin, add rich text to Description, save and reopen to confirm persistence.
• View the form's public URL and confirm description displays with formatting (paragraphs, lists) instead of smooshed plain text.
• Existing plain-text descriptions continue to render as before.

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