feat(dashboard,js-sdk,types): Update app layout, and add user sdk methods (#8182)

**What**
- Updates app layout (sidebar and topbar)
- Adds "System" option to theme toggle (we now default to system)
- Adds sdk methods for user endpoints (RESOLVES CC-67)

packages/admin-next/dashboard/src/components/forms/metadata-form/metadata-form.tsx

@@ -292,7 +292,7 @@ const GridInput = forwardRef<
       {...props}
       autoComplete="off"
       className={clx(
-        "txt-compact-small text-ui-fg-base placeholder:text-ui-fg-muted disabled:text-ui-fg-disabled disabled:bg-ui-bg-base px-2 py-1.5 outline-none",
+        "txt-compact-small text-ui-fg-base placeholder:text-ui-fg-muted disabled:text-ui-fg-disabled disabled:bg-ui-bg-base bg-transparent px-2 py-1.5 outline-none",
         className
       )}
     />