Desktop support (#4484)

* Remove home link on desktop app

* Spellcheck, installation toasts, background styling, …

* Add email,slack, auth support

* More desktop style tweaks

* Move redirect to client

* cleanup

* Record desktop usage

* docs

* fix: Selection state in search input when double clicking header

app/typings/window.d.ts

@@ -0,0 +1,68 @@
+declare global {
+  interface Window {
+    DesktopBridge: {
+      /**
+       * The name of the platform running on.
+       */
+      platform: string;
+
+      /**
+       * The version of the loaded application.
+       */
+      version: () => Promise<string>;
+
+      /**
+       * Restarts the application.
+       */
+      restart: () => Promise<void>;
+
+      /**
+       * Restarts the application and installs the update.
+       */
+      restartAndInstall: () => Promise<void>;
+
+      /**
+       * Tells the updater to check for updates now.
+       */
+      checkForUpdates: () => Promise<void>;
+
+      /**
+       * Passes double click events from titlebar area
+       */
+      onTitlebarDoubleClick: () => Promise<void>;
+
+      /**
+       * Adds a custom host to config
+       */
+      addCustomHost: (host: string) => Promise<void>;
+
+      /**
+       * Set the language used by the spellchecker on Windows/Linux.
+       */
+      setSpellCheckerLanguages: (languages: string[]) => Promise<void>;
+
+      /**
+       * Registers a callback to be called when the window is focused.
+       */
+      focus: (callback: () => void) => void;
+
+      /**
+       * Registers a callback to be called when the window loses focus.
+       */
+      blur: (callback: () => void) => void;
+
+      /**
+       * Registers a callback to be called when a route change is requested from the main process.
+       * This would usually be when it is responding to a deeplink.
+       */
+      redirect: (callback: (path: string, replace: boolean) => void) => void;
+
+      /**
+       * Registers a callback to be called when the application is ready to update.
+       */
+      updateDownloaded: (callback: () => void) => void;
+    };
+  }
+}
+
+export {};