Sibling sweep to dc2becf: NaturalDateInput.vue and ImageUpload.vue used
candlelight-/ember-/guild-* utility classes that aren't defined in the
project's Tailwind palette and rendered as no-ops. Swapped to inline
styles using --candle, --ember, --text-dim/faint/bright, --border,
--input-bg, --surface. Drag-state and parsed-date notices follow the
color-mix(... 15%) + 1px solid pattern from dc2becf.
