Add a button to show all content, if the zoom allows it. (#1406)

* add zoom center action button

* enhance zoom calculation and scroll to center

* add zoom out and center button

* filter deleted elements

* improve complexity

* add key shortcut

* calculate zoom value

* don't render zoomCenter action

* offset from top to account for shape menu

* change shortcut & add to shortcut dialog

* decrease offset

* revert offset

* change hotkey & description

* rename to zoomToFit

* change shortcut label & position

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

src/actions/types.ts

@@ -48,6 +48,7 @@ export type ActionName =
   | "zoomIn"
   | "zoomOut"
   | "resetZoom"
+  | "zoomToFit"
   | "changeFontFamily"
   | "changeTextAlign"
   | "toggleFullScreen"