canvas in a separate crate

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = ["client", "server", "common", "search"]
+members = ["client", "server", "common", "search", "canvas"]
 resolver = "2"
 
 [workspace.package]

canvas/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "canvas"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+description.workspace = true
+readme.workspace = true
+repository.workspace = true
+categories.workspace = true
+
+[dependencies]