feat: Add shortcuts for stroke and background color picker (#3318)

* feat: Add shortcuts for opening stroke and background color picker

* Use App.tsx keydown handler

* only get selectedElements if applicable (perf)

* fix tests and snaps

* reuse `appState.openMenu`

Co-authored-by: dwelle <luzar.david@gmail.com>

src/keys.ts

@@ -44,6 +44,7 @@ export const KEYS = {
   A: "a",
   D: "d",
   E: "e",
+  G: "g",
   L: "l",
   O: "o",
   P: "p",