- add countup-from-zero mode to the configurator and generated timer runtime
- expand the Google font catalog and update font loading/weight support
- replace the split font search/select with a single searchable custom font picker
- add configurable urgency color support
- fix last-10-seconds color shift and last-5-seconds shake behavior, including duration mode
- fix preview background rendering for transparent/dark/light/scene modes inside the iframe
- make timer digit blocks fixed-width to stop clipping and width shifts as values change
