feat: add shared UI package auth DI (#5720)

* feat: add shared UI package auth DI

* use refs instead of reactive

* pnpm prepr

* move app auth provider setup to src/providers/setup

packages/ui/src/providers/auth.ts

@@ -0,0 +1,12 @@
+import type { Labrinth } from '@modrinth/api-client/src/modules/labrinth/types'
+import type { Ref } from 'vue'
+
+import { createContext } from './create-context'
+
+export interface AuthProvider {
+	session_token: Ref<string | null>
+	user: Ref<Labrinth.Users.v2.User | null>
+	requestSignIn: (redirectPath: string) => void | Promise<void>
+}
+
+export const [injectAuth, provideAuth] = createContext<AuthProvider>('root', 'auth')

packages/ui/src/providers/index.ts

@@ -1,5 +1,6 @@
 export * from './api-client'
 export * from './app-backup'
+export * from './auth'
 export * from './content-manager'
 export { createContext } from './create-context'
 export * from './file-picker'