- Remove asterisks from UK/US country names (#153)
- Remove unclear "Flat rate" option (#153)
- Alphabetize country list, move China to correct position (#153)
- Rename "Unit" to "Currency" (#154)
- Rename cost label to "Default shipping cost" (#154)
- Add currency suffix to cost field (#154)
- Add hint about per-product shipping costs (#154)
- Add validation for whole number sats (#155)
- Disable submit button when sats validation fails (#155)
- Show error message for invalid sats values (#155)
Closes#153, #154, #155🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
