feat(Wind): Add ShowOpenDialog and ShowSaveDialog to FilesService

Add native file dialog methods to the FilesService interface, stub, and live implementation. ShowOpenDialog returns selected URIs (with options for title, filters, multi-select, folder selection), while ShowSaveDialog returns a selected path (with options for title, defaultUri, filters). The live implementation uses IPC to invoke UserInterface.ShowOpenDialog and UserInterface.ShowSaveDialog on the Mountain backend, completing the file dialog integration in Wind's service layer.

Author: NikolaRHristov

Source/Effect/Files/Implementation/FilesStub.ts

@@ -2,6 +2,19 @@ import { Effect } from "effect";
 
 import type { FilesService } from "../Interface/FilesService.js";
 
-export const StubFilesService: FilesService = {} as FilesService;
+export const StubFilesService: FilesService = {
+	ReadFile: () => Effect.die(new Error("stub")),
+	WriteFile: () => Effect.void,
+	Stat: () => Effect.die(new Error("stub")),
+	ReadDir: () => Effect.succeed([]),
+	CreateDirectory: () => Effect.void,
+	Delete: () => Effect.void,
+	Rename: () => Effect.void,
+	Copy: () => Effect.void,
+	Exists: () => Effect.succeed(false),
+	Watch: () => Effect.succeed({ dispose: () => {} }),
+	ShowOpenDialog: () => Effect.succeed([]),
+	ShowSaveDialog: () => Effect.succeed(undefined),
+};
 
 export default StubFilesService;

Source/Effect/Files/Interface/FilesService.ts

@@ -44,4 +44,23 @@ export interface FilesService {
 	readonly Watch: (
 		uri: string,
 	) => Effect.Effect<{ readonly dispose: () => void }, FilesProblem>;
+	/** Show a native file-open dialog. Returns selected URIs or empty array. */
+	readonly ShowOpenDialog: (options?: {
+		readonly title?: string;
+		readonly filters?: ReadonlyArray<{
+			readonly name: string;
+			readonly extensions: ReadonlyArray<string>;
+		}>;
+		readonly canSelectMany?: boolean;
+		readonly canSelectFolders?: boolean;
+	}) => Effect.Effect<readonly string[], FilesProblem>;
+	/** Show a native file-save dialog. Returns selected URI or undefined. */
+	readonly ShowSaveDialog: (options?: {
+		readonly title?: string;
+		readonly defaultUri?: string;
+		readonly filters?: ReadonlyArray<{
+			readonly name: string;
+			readonly extensions: ReadonlyArray<string>;
+		}>;
+	}) => Effect.Effect<string | undefined, FilesProblem>;
 }

Source/Effect/Files/Live.ts

@@ -177,6 +177,26 @@ export const LiveFilesServiceLayer = Layer.effect(
 						Effect.mapError(MakeFilesProblem),
 					);
 			},
+
+			ShowOpenDialog: (Options) =>
+				IPCService.invoke("UserInterface.ShowOpenDialog")([
+					Options ?? {},
+				]).pipe(
+					Effect.map((Result) =>
+						Array.isArray(Result) ? (Result as string[]) : [],
+					),
+					Effect.mapError(MakeFilesProblem),
+				),
+
+			ShowSaveDialog: (Options) =>
+				IPCService.invoke("UserInterface.ShowSaveDialog")([
+					Options ?? {},
+				]).pipe(
+					Effect.map((Result) =>
+						typeof Result === "string" ? Result : undefined,
+					),
+					Effect.mapError(MakeFilesProblem),
+				),
 		};
 
 		return Service;