chore(dev): Switch to using build constant for isDev check

apps/desktop/src/global.d.ts

@@ -1,2 +1,10 @@
 declare module "forcefocus";
 declare const ipc: typeof import("./preload").ipc;
+
+/**
+ * Will be turned into a constant string in the main process only
+ * likely either `"development"` or `"production"`.
+ *
+ * This is done using the `DefinePlugin` in our webpack files.
+ */
+declare const BIT_ENVIRONMENT: string;