Firefly Boards: Zoom in-out need better keyboard shortcuts

In Boards CMD-+ and CMD-- are often capture by the browser resulting in zooming and/or out the whole interface not the canvas, please add a simple "+" and "-" key shortcut (like in google maps) to be able to differentiate. Moreover, please make the zoom go towards the selected item if any, and not to the  center. 

And please.. do provide a "Zoom to fit all" shortcut like "0" key

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