test(wa-sqlite): cover SharedWorker OPFS lifecycle

[marcus-pousette]

Summary

• add SharedWorker to the browser OPFS lifecycle matrix
• exercise long filenames across write, reload, persisted read, and drop
• cover both explicit close and abrupt reload
• start each lifecycle from its unique document ID and filename without a pre-clean client

Each case uses a fresh randomized OPFS path, so the first client created is the runtime under test. The final drop still verifies cleanup and removes the test store.

Verification

• pnpm -C packages/treecrdt-wa-sqlite/e2e exec playwright test tests/lifecycle.spec.ts --project=chromium-dev (6 passed)
• focused Prettier check
• git diff --check