Fix recurring React #418 hydration mismatch on /practicas/[id] (ICU time-separator class)

React #418 hydration text-mismatch recurring on /practicas/[id] detail render (observed on a5042147-ccb6-48e4-9597-2c5fcd1658dd: 07-06 03:14+03:15, 07-07 07:19 — pre-existing, NOT from cdbac39 which was a pure static-Link removal). Known venus #418 class: client toLocale*/Intl time rendering emits Node's U+202F narrow-no-break-space vs browser regular space → server/client byte divergence. Fix: locate the offending toLocale*/Intl/new Date() time render in the práctica-detail render tree (not practica-detail.tsx itself — confirmed clean) and convert to formatToParts with a normalized separator, OR server-format and pass as a string prop so server+client render identical bytes. NOT toIsoTimestamp. Ref memory reference_react_418_icu_separator_class. Reversible, solo+divergent-auditor.