perf(studio): stream nitro repair progress over SSE and allow cancelling

src/lib/services/nitro-cleanup.test.ts

@@ -88,6 +88,7 @@ vi.mock("node:fs", async (orig) => {
 import {
 	autoCleanFakeNitros,
 	deleteNitroCleanupFiles,
+	type NitroRepairProgress,
 	repairBrokenNitros,
 	scanFakeBrokenNitros,
 } from "@/lib/services/nitro-cleanup";
@@ -471,4 +472,59 @@ describe("repairBrokenNitros", () => {
 		expect(result.failed).toBe(1);
 		expect(result.errors[0]).toMatch(/could not re-obtain/);
 	});
+
+	it("reports per-bundle progress while re-downloading", async () => {
+		getTargetsFn.mockResolvedValue({
+			nitroDir: "/a/nitro",
+			swfDir: "/a/swf",
+			iconDir: "/a/icons",
+			mirrorDirs: [],
+		});
+		readFileFn.mockResolvedValue(Buffer.from("nitro-data"));
+		parseNitroBundle.mockReturnValue({});
+		downloadFileFn.mockResolvedValue({ ok: true, size: 100 });
+
+		const events: NitroRepairProgress[] = [];
+		const result = await repairBrokenNitros(["a.nitro", "b.nitro"], {
+			onProgress: (progress) => events.push(progress),
+		});
+
+		expect(result.repaired).toBe(2);
+		expect(events).toHaveLength(2);
+		expect(events.map((e) => e.completed).sort()).toEqual([1, 2]);
+		expect(events[events.length - 1]).toMatchObject({
+			total: 2,
+			ok: 2,
+			failed: 0,
+		});
+		expect(events[0].total).toBe(2);
+	});
+
+	it("counts successes and failures in repair progress", async () => {
+		getTargetsFn.mockResolvedValue({
+			nitroDir: "/a/nitro",
+			swfDir: "/a/swf",
+			iconDir: "/a/icons",
+			mirrorDirs: [],
+		});
+		readFileFn.mockResolvedValue(Buffer.from("nitro-data"));
+		parseNitroBundle.mockReturnValue({});
+		downloadFileFn.mockImplementation(async (url: string) => ({
+			ok: url.includes("a.nitro"),
+			size: 100,
+			error: url.includes("b.nitro") ? "HTTP 404" : undefined,
+		}));
+
+		const events: NitroRepairProgress[] = [];
+		await repairBrokenNitros(["a.nitro", "b.nitro"], {
+			onProgress: (progress) => events.push(progress),
+		});
+
+		expect(events.map((e) => e.completed).sort()).toEqual([1, 2]);
+		expect(events[events.length - 1]).toMatchObject({
+			total: 2,
+			ok: 1,
+			failed: 1,
+		});
+	});
 });