[2.16.0] L'onglet Rimes rejoint le look Hasard/Syllabes

• 2.16.0 — Rimes tab ergonomics pass and a real filtering bug fix:
  • Fixed: the rhyme-quality filters (Pauvre/Suffisante/Riche+/Très riche/Léonine) had a
    silent edge case — unchecking every one of the 3 main checkboxes was treated internally as
    "no filter" instead of "show nothing", and the Très riche/Léonine sub-filters could only
    narrow within Riche+, never exclude the plain "riche" category on their own. Checking
    just "Léonine", for instance, still silently showed "Suffisante" results too. The 5
    qualities are now independent, always-applied checkboxes (Riche is no longer a parent that
    can only be narrowed, it's just one of the five) — unchecking all of them now correctly
    shows nothing. "Riche+" is kept as a one-click action button that checks/unchecks
    Riche + Très riche + Léonine together, but it's no longer a piece of state itself, so it
    can't drift out of sync with the checkboxes it acts on.
  • The filter checkboxes, the "Toutes syllabes" dropdown, and "Mode assonance" are now
    pill-style buttons matching the Hasard/Syllabes tabs, coloured to match each quality's
    badge colour in the results below; "Mode assonance" moved onto the same row as "Compléter
    en ligne", and the syllable-count dropdown got a small ▾ to signal it opens a menu.
  • "Pauvre" is now unchecked by default (Suffisante/Riche/Très riche/Léonine still on).