fix: memory issues when importing giant mrpack files (#6278)

* feat: dont load mrpacks into memory if they are local imports

* fix: frontend

packages/ui/src/providers/file-picker.ts

@@ -9,11 +9,21 @@ export interface PickedFile {
 	previewUrl: string
 }
 
+export interface PickedModpackFile extends Omit<PickedFile, 'file'> {
+	/** Only present for upload flows; native imports avoid copying huge packs into the webview heap. */
+	file?: File
+}
+
+export interface PickModpackFileOptions {
+	/** Set to false when a native path can be streamed directly by the backend. */
+	readFile?: boolean
+}
+
 export interface FilePickerProvider {
 	/** Pick an image file (for icons) */
 	pickImage: () => Promise<PickedFile | null>
 	/** Pick a .mrpack modpack file */
-	pickModpackFile: () => Promise<PickedFile | null>
+	pickModpackFile: (options?: PickModpackFileOptions) => Promise<PickedModpackFile | null>
 }
 
 export const [injectFilePicker, provideFilePicker] = createContext<FilePickerProvider>('FilePicker')