Lemenzo Clock v2.4 — Complete Spanish localization

- values-es/strings.xml has exact 1:1 key parity with values/strings.xml.
- All user-facing English UI strings have been translated to Spanish.
- Launcher brand remains "Clock" by explicit product decision.
- In-app brand remains "Lemenzo Clock".
- Language-neutral time/unit formats such as "%1$d min", "%1$dh %2$dm"
  and pure placeholder strings remain unchanged because they are valid Spanish notation.
- Placeholder signatures are identical to the base locale.
- Spanish remains registered in res/xml/locale_config.xml.