* convert Cypress tests to TypeScript
this work was done by @lunaisnotaboy https://github.com/lunaisnotaboy
for their fork https://github.com/cutiekey/cutiekey/pull/7
I just repacked their changes into a minimal set
* fix call to `window` in cypress tests
this error was spotted thanks to the TypeScript compiler:
```
support/commands.ts:33:12 - error TS2559: Type '(win: any) => void'
has no properties in common with type 'Partial<Loggable &
Timeoutable>'.
33 cy.window(win => {
~~~~~~~~
Found 1 error in support/commands.ts:33
```
(again, @lunaisnotaboy did the actual work)
