test: add unit and component tests across the monorepo

Adds ~1000 tests to bring the previously-untested packages and apps
under coverage:

- packages/utils — string, color, date, file, level, locale, sanitize,
  field, html, network-icons, rate-limit, url, url-security, monorepo,
  resume/patch, resume/docx/link-utils, style helpers (~97% on the
  testable utility files)
- packages/ui — 28 component test files plus the use-controlled-state,
  use-mobile, use-confirm, use-prompt hooks (95% statements)
- packages/pdf — shared template helpers (filtering, columns, picture,
  metrics, section-links, page-size, rich-text-html, section-title)
- packages/schema — resumeDataSchema, page, templates, default
- packages/fonts — expanded coverage on font helpers
- packages/ai — resume sanitize and extraction template
- packages/api — resume-access-policy
- apps/web — error-message, locale, theme, pwa, dialogs/store, and
  the resume/move-item / section-actions / make-section-item helpers

Adds jsdom polyfills (ResizeObserver, IntersectionObserver,
scrollIntoView, matchMedia) and an explicit React Testing Library
cleanup hook to vitest.setup.ts so portal- and overlay-based components
work without per-test setup.

packages/utils/src/url.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, it } from "vitest";
+import { createUrl } from "./url";
+
+describe("createUrl", () => {
+	it("returns empty url and label when no url provided", () => {
+		expect(createUrl()).toEqual({ url: "", label: "" });
+	});
+
+	it("returns empty pair when url is empty string (falsy)", () => {
+		expect(createUrl("")).toEqual({ url: "", label: "" });
+	});
+
+	it("uses url as label when no label provided", () => {
+		expect(createUrl("https://example.com")).toEqual({
+			url: "https://example.com",
+			label: "https://example.com",
+		});
+	});
+
+	it("preserves provided label", () => {
+		expect(createUrl("https://example.com", "Example")).toEqual({
+			url: "https://example.com",
+			label: "Example",
+		});
+	});
+
+	it("falls back to url when label is empty string", () => {
+		expect(createUrl("https://example.com", "")).toEqual({
+			url: "https://example.com",
+			label: "https://example.com",
+		});
+	});
+
+	it("does not validate the url format (caller's responsibility)", () => {
+		expect(createUrl("not-a-url", "Label")).toEqual({
+			url: "not-a-url",
+			label: "Label",
+		});
+	});
+});