v0.0.4

test: add SW routing tests covering font-interception crash prevention

Documents the fetch routing rules in public/sw.js that prevent the
OnlyOffice v7.5 units_per_EM crash:
- Font files (.ttf/.woff/.woff2/.otf/.eot) must bypass the SW to avoid
  added latency that triggers Chrome's font-loading intervention
- Document URLs (?src=, ?file=) bypass the cache to stay fresh
- Cross-origin and non-GET requests are not intercepted

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