fix(ci): run client coverage even when server coverage fails

Replace && with ; in test:coverage so the client vitest run is not
short-circuited when the server run exits non-zero (e.g. threshold
violation or test failure). Without this the upload-artifact step
only ever sees coverage/server.

Also updates the stale CLAUDE.md comment that said server-only.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/CLAUDE.md

@@ -165,7 +165,7 @@ npm run check       # svelte-check (type checking)
 
 ```bash
 npm run test              # Vitest unit + server tests (headless)
-npm run test:coverage     # Coverage report (server project only)
+npm run test:coverage     # Coverage report (server + client)
 npm run test:e2e          # Playwright E2E tests
 npm run test:e2e:headed   # Playwright E2E with visible browser
 npm run test:e2e:ui       # Playwright UI mode

frontend/package.json

@@ -16,7 +16,7 @@
 		"lint:boundary-demo": "eslint src/lib/tag/__fixtures__/",
 		"test:unit": "vitest",
 		"test": "npm run test:unit -- --run",
-		"test:coverage": "vitest run --coverage --project=server && vitest run -c vitest.client-coverage.config.ts --coverage",
+		"test:coverage": "vitest run --coverage --project=server; vitest run -c vitest.client-coverage.config.ts --coverage",
 		"test:e2e": "playwright test",
 		"test:e2e:headed": "playwright test --headed",
 		"test:e2e:ui": "playwright test --ui",