[2.21.0] Couleurs adoucies dans l'onglet Rimes

• 2.21.0 — Two ergonomic changes to the Rimes tab, both purely cosmetic, no behaviour
  change:
  • The rhyme-quality pill colours (Pauvre/Suffisante/Riche/Très riche/Léonine) are noticeably
    softer now — same hue family, less saturated, slightly lighter — instead of the fairly
    strong original palette. Applies everywhere that palette is used: the pills themselves, the
    small coloured left border on word chips in Rimes/Synonymes results, and the quality-summary
    dots. Checked-pill text switched from white to a dark grey to keep it readable against the
    lighter fills (white text on the lightened colours was dropping well below a readable
    contrast ratio on some of them, most noticeably "Léonine").