add always visible lock icon on top right to show info about e… (#1403)

* improvement(layerui.js): add lock icon on top right to show encrypted info about excalidraw

fixes https://github.com/excalidraw/excalidraw/issues/1313

* swap lock with shield

* fix dimensions

* make link open in new tab

* add newline between toolip text and link

* increase tooltip line-height

* remove unused GitHubCorner compo

* reposition; reintroduce GH icon

* make shield into link

* make tooltip not show when drawing

* Review fix

* remove link from tooltip

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

src/is-mobile.tsx

@@ -7,7 +7,7 @@ export function IsMobileProvider({ children }: { children: React.ReactNode }) {
   if (!query.current) {
     query.current = window.matchMedia
       ? window.matchMedia(
-          "(max-width: 600px), (max-height: 500px) and (max-width: 1000px)",
+          "(max-width: 640px), (max-height: 500px) and (max-width: 1000px)",
         )
       : (({
           matches: false,