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/components/ui/Category.tsx

@@ -33,6 +33,7 @@ const CategoryBase = styled.div<Pick<Props, 'variant'>>`
 
 type Props = Omit<JSX.HTMLAttributes<HTMLDivElement>, 'children' | 'as'> & {
     text: Children;
+    // TODO: rename from action to prevent type conflicts with the dom
     action?: () => void;
     variant?: 'default' | 'uniform';
 }