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/design-system/ui/src/components/dropdown-menu/dropdown-menu.tsx

@@ -50,13 +50,13 @@ const SubMenuTrigger = React.forwardRef<
       "focus-visible:bg-ui-bg-component-hover focus:bg-ui-bg-component-hover",
       "active:bg-ui-bg-component-pressed",
       "data-[disabled]:text-ui-fg-disabled data-[disabled]:pointer-events-none",
-      "data-[state=open]:bg-ui-bg-base-hover",
+      "data-[state=open]:!bg-ui-bg-component-hover",
       className
     )}
     {...props}
   >
     {children}
-    <ChevronRightMini className="ml-auto" />
+    <ChevronRightMini className="ml-auto text-ui-fg-muted" />
   </Primitives.SubTrigger>
 ))
 SubMenuTrigger.displayName = "DropdownMenu.SubMenuTrigger"