Fix Commands button to show correct shortcut on Windows and Linux (#3625)

* Fix Commands button to show correct shortcut

* Fix onboarding to use the same shortcut reference

* Rename test file to be more general

* Add test for commands button text

* Remove outdated reference to Ctrl+/

* Change shortcut separator to be + and no spaces

* Add JSDocs and improve comments

* Add unit tests

* Change control modifier to regular ASCII caret

* Add browser test and fix platform detection

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu-latest)

* Add useful debug info to the error message

* Fix to display metaKey as Super on Linux

* Revert "A snapshot a day keeps the bugs away! 📷🐛 (OS: windows-latest)"

This reverts commit f8da90d5d2.

* A snapshot a day keeps the bugs away! 📷🐛 (OS: windows-latest)

* Approve snapshots

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Jess Frazelle <jessfraz@users.noreply.github.com>

src/components/CommandBar/CommandBar.tsx

@@ -9,6 +9,8 @@ import useHotkeyWrapper from 'lib/hotkeyWrapper'
 import { CustomIcon } from 'components/CustomIcon'
 import Tooltip from 'components/Tooltip'
 
+export const COMMAND_PALETTE_HOTKEY = 'mod+k'
+
 export const CommandBar = () => {
   const { pathname } = useLocation()
   const { commandBarState, commandBarSend } = useCommandsContext()
@@ -24,7 +26,7 @@ export const CommandBar = () => {
   }, [pathname])
 
   // Hook up keyboard shortcuts
-  useHotkeyWrapper(['mod+k'], () => {
+  useHotkeyWrapper([COMMAND_PALETTE_HOTKEY], () => {
     if (commandBarState.context.commands.length === 0) return
     if (commandBarState.matches('Closed')) {
       commandBarSend({ type: 'Open' })