fix: explicitly use window.OC global in app config

[st3iny]

(Production) bundles generated by vite break if the optimizer generates a const declaration that randomly has the name OC.

Uncaught ReferenceError: can't access lexical declaration 'OC' before initialization

A lexical variable was accessed before it was initialized. This happens within any scope (global, module, function, or block) when variables declared with let or const are accessed before the place where they are declared has been executed.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Cant_access_lexical_declaration_before_init#what_went_wrong

[st3iny]

/backport to stable1

[susnux]

🤯