Summary

Add individual date and time part format options when binding CMS date/time fields to text, allowing users to display just the day, month, year, hour, minute, or AM/PM independently.

Changes

• Add "Date parts" preset section with weekday, month, day, and year variants (long/short, padded/unpadded)
• Add "Time parts" preset section with hour (12h/24h, padded/unpadded), minute, and AM/PM
• Add detail helper text to part presets for clarity in the dropdown
• Use a fixed sample date for all format previews so padding differences are visible
• Make the format selector popover scrollable for long preset lists
• Fix SSR date formatting to use raw ISO values instead of pre-formatted strings when applying custom format presets

Test plan

• Bind a date/time CMS field to a text layer and verify all new part formats appear in the dropdown
• Bind a date-only CMS field and verify only date parts appear (no time parts)
• Select a part format (e.g. "Month name") and verify it renders correctly on canvas
• Publish the page and verify the same format renders correctly on the generated page
• Verify the format dropdown scrolls when the list is long
• Verify preview labels show correct padding differences (e.g. "7" vs "07")