Add dummy variables to packages

Also commit latest sketches.cdr

components/input/dummy.go

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+package input
+
+// Dummy can be referenced in vugu files to prevent go from causing errors due to not used imports.
+//
+// Use it like this:
+//
+//	_ = input.Dummy
+var Dummy struct{}

components/layout/dummy.go

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+package layout
+
+// Dummy can be referenced in vugu files to prevent go from causing errors due to not used imports.
+//
+// Use it like this:
+//
+//	_ = layout.Dummy
+var Dummy struct{}

components/navigation/dummy.go

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+package navigation
+
+// Dummy can be referenced in vugu files to prevent go from causing errors due to not used imports.
+//
+// Use it like this:
+//
+//	_ = navigation.Dummy
+var Dummy struct{}

components/overlay/dummy.go

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+package overlay
+
+// Dummy can be referenced in vugu files to prevent go from causing errors due to not used imports.
+//
+// Use it like this:
+//
+//	_ = overlay.Dummy
+var Dummy struct{}

components/view/dummy.go

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+package view
+
+// Dummy can be referenced in vugu files to prevent go from causing errors due to not used imports.
+//
+// Use it like this:
+//
+//	_ = view.Dummy
+var Dummy struct{}

icons/dummy.go

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+package icons
+
+// Dummy can be referenced in vugu files to prevent go from causing errors due to not used imports.
+//
+// Use it like this:
+//
+//	_ = icons.Dummy
+var Dummy struct{}