Add docs/solutions/ui-bugs/ learning for the silent animation freeze caused
by transition tokens (duration+easing pairs) used as bare durations, and
update dashboard-guide.md design-token and pitfalls sections to cover the
new --duration-* tokens and the IACVT gotcha.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
