feat(API): media field type

docs/design/components.md

@@ -121,3 +121,13 @@ Frames: `SchemaFrame.dc.html` (all schema, content and entry bodies; relation, p
 | RelationField (later) | New | UInputMenu multiple | Chips and search |
 | PermissionsGrid (later) | New | UTable + UCheckbox; UCard list on mobile |  |
 | SchemaImportDialog (later) | New | UModal + UFileUpload |  |
+
+## Media field (pass 5)
+
+Frames: `SchemaFrame.dc.html` (`MCtl`) and `MediaFrame.dc.html` (picker in field mode, usage). Full spec: `media-field-changes.md`.
+
+| Component | Status | Nuxt UI | Notes |
+|---|---|---|---|
+| MediaFieldControl | New | UFormField, UButton outline and ghost, UModal (desktop) or bottom UDrawer (mobile) for the picker, UTooltip, UIcon (image, image-off, unlink, image-plus). The thumbnail is a plain button | Props label, required, modelValue (image id or null), image (filename, width, height, size, or missing), disabled, error. Emits update:modelValue. States: empty, filled, hover, focus, error, missing, saving, read-only |
+| FieldCell (media) | Extended | Thumbnail 40 px square, dash when empty, dashed square with unlink when the image is gone | Row height 48 px, mobile card thumbnail 32 px |
+| MediaPicker (field mode) | Extended | Existing picker | Title "Choose an image", "Use this image", no alt text, no variant select, "Current" badge, optional "No image" row |