v0.1.15

Added

• c.nested :assoc, fields: [...] DSL renders existing has_many records as an inline editable table using accepts_nested_attributes_for
• Nested rows include a destroy button (×) and a _destroy hidden field; clicking hides the row and marks it for deletion on save
• A blank add row is always rendered at the bottom of the nested table for creating new records
• image_url fields on index and dashboard tables now render as <img> tags instead of raw URLs
• belongs_to fields now render correctly on dashboard tables (was missing)
• Shared backstage/shared/_cell partial extracted for consistent field rendering across index and dashboard views