Define a UI pattern for tiles

agaric/templates/patterns/tile/tile.ui_patterns.yml

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+tile:
+  label: Tile
+  description: A small teaser linking to content from a list displayed as a grid.
+  variants:
+    default:
+      label: Default
+      description: A plain tile.
+    berry:
+      label: Berry
+      description: A purple-colored tile.
+    cinnamon:
+      label: Cinnamon
+      description: An orange-colored tile.
+    blue:
+      label: Blue
+      description: A blue-colored tile.
+    marine:
+      label: Marine
+      description: A blue-green tile.
+  fields:
+    title:
+      type: text
+      label: Title
+      description: Tile title.
+      preview: ACME Dynamite
+    subtitle:
+      type: text
+      label: Subtitle
+      description: Tile subtitle.
+      preview: An explosive web site