test(04-06): Wave 0 — inline-SVG source-contract RED + cursor-visibility regression pin

- tests/welcome/inline-svg.test.ts (NEW; 3 tests, node-env source-contract):
  - Test A: mokosh-mark.svg carries stroke="currentColor" + viewBox="0 0 32 32"
    (currently RED — SVG still has stroke="#181b2a").
  - Test B: welcome.ts uses ?raw import + DOMParser + replaceChildren and
    does NOT use innerHTML (MV3 CSP discipline / T-04-06-01).
    Currently RED — welcome.ts still ?url + <img>.
  - Test C: globals.d.ts declares the *.svg?raw ambient module.
    Currently RED — only *.svg?url + *.webm?url declared.
- tests/build/cursor-visibility.test.ts (NEW; 1 test, node-env file-grep):
  - GREEN-on-arrival regression pin for the cursor: 'always' literal at
    src/offscreen/recorder.ts:285 (shipped opportunistically Plan 01-09).
- Mirrors the canonical tests/i18n/manifest-i18n.test.ts scaffold
  (readFileSync + expect(text).toContain(...)) — vitest is environment:'node'
  and the project ships no DOM-emulation library, so the inline-svg test
  pins source TEXT only; the live-DOM injection + currentColor cascade is
  verified by the host-side harness assertion A35 (Task 3).

tests/welcome/inline-svg.test.ts

@@ -0,0 +1,67 @@
+// tests/welcome/inline-svg.test.ts — Plan 04-06 Wave 0 RED → GREEN unit test
+// for the UI-SPEC dark-logo `currentColor` strategy (Option A).
+//
+// SCOPE — source-contract pin only (node-env file-read + string assertions).
+//
+// vitest is configured with `environment: 'node'` (vitest.config.ts:18) and
+// the project ships no DOM-emulation library — neither jsdom, happy-dom nor
+// linkedom is in node_modules. This test pins the SOURCE TEXT contract of
+// the inline-SVG injection strategy (the SVG source carries the
+// `currentColor` stroke, welcome.ts uses the `?raw` import + DOMParser +
+// replaceChildren, globals.d.ts declares the `*.svg?raw` ambient module).
+//
+// It does NOT instantiate any document, does NOT call populateMark, does
+// NOT invoke DOMParser at runtime. The runtime behavior (live <svg>
+// injection into the welcome page DOM and the currentColor CSS cascade
+// through `.welcome-hero__mark { color: var(--mks-fg-inverse); }`) is
+// verified by the host-side UAT harness assertion A35 (driveA35 in
+// tests/uat/lib/harness-page-driver.ts) — A35 opens welcome.html as a real
+// Puppeteer tab so populateMark() actually runs, then reads
+// `getComputedStyle().stroke` on the injected <svg> to prove the cascade
+// resolves. This split mirrors the project's two-layer test approach
+// (source contract under vitest + live-DOM behavior under the Puppeteer
+// harness) — verified at re-plan iter-2 (BLOCKER 1 resolution).
+//
+// References:
+//   - .planning/phases/04-harden-clean-up-optional/04-UI-SPEC.md
+//     §"Implementation amendment" (currentColor + inline <svg> technique)
+//   - .planning/phases/04-harden-clean-up-optional/04-RESEARCH.md
+//     §SVG currentColor cascade (W3C SVG2 §13.3)
+//   - tests/i18n/manifest-i18n.test.ts (the canonical node-env file-read
+//     + string-assertion scaffold this test mirrors).
+//   - https://vite.dev/guide/assets.html#importing-asset-as-string
+//     (Vite `?raw` query suffix returns module content as a string).
+
+import { describe, expect, it } from 'vitest';
+import { readFileSync } from 'node:fs';
+import { resolve as resolvePath } from 'node:path';
+
+const MARK_SVG_PATH = resolvePath(
+  process.cwd(),
+  'src/shared/brand/mokosh-mark.svg',
+);
+const WELCOME_TS_PATH = resolvePath(process.cwd(), 'src/welcome/welcome.ts');
+const GLOBALS_DTS_PATH = resolvePath(process.cwd(), 'globals.d.ts');
+
+describe('UI-SPEC dark-logo currentColor strategy — source-level contract', () => {
+  it('mokosh-mark.svg: root <svg> uses stroke="currentColor" + canonical viewBox; legacy #181b2a stroke removed', () => {
+    const text = readFileSync(MARK_SVG_PATH, 'utf8');
+    expect(text).toContain('stroke="currentColor"');
+    expect(text).toContain('viewBox="0 0 32 32"');
+    expect(text).not.toContain('stroke="#181b2a"');
+  });
+
+  it('welcome.ts: uses `?raw` import + DOMParser + replaceChildren; no `?url` import, no innerHTML (MV3 CSP discipline / T-04-06-01)', () => {
+    const text = readFileSync(WELCOME_TS_PATH, 'utf8');
+    expect(text).toContain('mokosh-mark.svg?raw');
+    expect(text).toContain('DOMParser');
+    expect(text).toContain('replaceChildren');
+    expect(text).not.toContain('mokosh-mark.svg?url');
+    expect(text).not.toContain('innerHTML');
+  });
+
+  it('globals.d.ts: declares the `*.svg?raw` ambient module (mirror of the existing `*.svg?url` block)', () => {
+    const text = readFileSync(GLOBALS_DTS_PATH, 'utf8');
+    expect(text).toContain("declare module '*.svg?raw'");
+  });
+});