Polish node graph frames and rename them for clarity (#1104)

* Polish layer panel UI and layer type icons/text

* Assorted UI text and comment cleanup

* Insert Transform node before Imaginate node via tool

* Rename "Node Graph Frame" to Layer type and Frame tool

* Rename "Node Graph Frame" to "Frame" tool

* Update Node Graph Frame -> Frame tool icon

* Fix lint warnings

node-graph/graph-craft/src/document.rs

@@ -124,7 +124,7 @@ impl DocumentNode {
 
 /// Represents the possible inputs to a node.
 ///
-/// # Short circuting
+/// # More about short circuting
 ///
 /// In Graphite nodes are functions and by default, these are composed into a single function
 /// by inserting Compose nodes.
@@ -493,7 +493,7 @@ impl NodeNetwork {
 				(
 					0,
 					DocumentNode {
-						name: "Input".into(),
+						name: "Input Frame".into(),
 						inputs: vec![NodeInput::Network(concrete!(u32))],
 						implementation: DocumentNodeImplementation::Unresolved("graphene_core::ops::IdNode".into()),
 						metadata: DocumentNodeMetadata { position: (8, 4).into() },