Ignore malformed static byte ranges.

[samuel-williams-shopify]

Summary

• Ignore malformed Range headers while serving static files.
• Resolve ranges before conditional header access and pass the result into LocalFile#serve.
• Treat unsupported multiple ranges as an intentional full-file response rather than an outstanding TODO.

Verification

• bundle exec sus test/utopia/static.rb
• bundle exec rubocop lib/utopia/static/middleware.rb lib/utopia/static/local_file.rb test/utopia/static.rb
• bundle exec bake decode:index:coverage lib
• git diff --check

The full local suite reached 488 passing tests, but four generated-project tests failed during Bundler setup because the shared vendor/bundle contains native extensions built for a different Ruby. The focused tests and branch-related checks pass.