remove most uses of as any in typescript

- replaced many uses of `as any` with another more specific cast `as T`
- filled in missing typed for items that needed to be typed
  - new runtime code was added where necessary to satisfy the new types with comments
- added missing theme variable "sidebar-active" to the Theme variables
- forms using `react-hook-form` are now typechecked
- changed some instances of `target` into `currentTarget` while removing `as any` assertions

src/pages/settings/panes/Notifications.tsx

@@ -78,11 +78,11 @@ export function Component({ options, dispatcher }: Props & WithDispatcher) {
 
                                 // tell the server we just subscribed
                                 const json = sub.toJSON();
-                                if (json.keys) {
+                                if (json.keys) {;
                                     client.req("POST", "/push/subscribe", {
                                         endpoint: sub.endpoint,
-                                        ...json.keys
-                                    } as any);
+                                        ...(json.keys as { p256dh: string, auth: string })
+                                    });
                                     setPushEnabled(true);
                                 }
                             } else {