fix(badge): dynamic width from title length, drop 32-char ellipsis

[Flotapponnier]

Summary

• Badge canvas width is computed per request from the longest line (monospace advance is predictable), so full bench titles render without the trailing ellipsis
• Bounded to 300..760px; titles that would exceed the cap still get an ellipsis at the computed budget instead of a fixed 32 chars

Test plan

• Rendered the longest live title (rpc-capabilities, 74 chars) in headless Chrome: fits with margin before the OCB wordmark
• tsc + bun test pass