feat(ci): add frontend CI workflow and exclude UI tests from unit tests

[SamuelMessmer]

No description provided.

[Copilot]

Pull request overview

Adds a dedicated GitHub Actions workflow to run the frontend’s unit (Vitest) and UI/component (Playwright CT) test suites on PRs and main-branch pushes, and updates the Vitest config so UI tests aren’t executed as part of unit tests.

Changes:

• Add Frontend CI GitHub Actions workflow that runs npm run test and npm run test:ui, and uploads the Playwright HTML report artifact.
• Update Vitest configuration to exclude src/ui-tests from unit test runs.
• Remove the “downloadFile returns a blob” unit test case from the API client tests.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
frontend/vite.config.ts	Excludes ui-tests from Vitest to prevent Playwright specs from running as unit tests.
frontend/src/api/__tests__/client.test.ts	Removes one downloadFile success-path unit test (coverage impact).
.github/workflows/frontend-ci.yml	Adds a CI workflow to run unit + UI tests and upload Playwright report artifacts.

Comments suppressed due to low confidence (1)

frontend/src/api/tests/client.test.ts:191

• This change removes the only “happy path” coverage for apiClient.downloadFile (successfully returning a Blob). Consider restoring a success test (e.g., validating the returned blob’s type/size or decoded text) so regressions in handleBlobResponse() aren’t missed while still keeping the existing error-case test.

    it("downloadFile throws on error", async () => {
        vi.spyOn(globalThis, "fetch").mockResolvedValue(
            new Response(JSON.stringify({detail: "Not found"}), {
                status: 404,
                statusText: "Not Found",
                headers: {"content-type": "application/json"},
            }),
        );

        const {apiClient} = await import("../client");
        await expect(apiClient.downloadFile("/test")).rejects.toThrow(ApiError);
    });

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