[2.17.0] Un nouveau volet Sonorités : allitérations, assonances, homéotéleutes

• 2.17.0 — New "Sonorités" panel in the Syllabes tab (flip the card with the button next to
  Export/Copy/Clear — now a cyan pill on the left): detects allitérations (repeated initial
  consonant sound), internal assonances (repeated vowel, not just end-of-line rhyme), and
  homéotéleutes (echoing word endings elsewhere in the poem, not just the rhyme scheme — only
  surfaced when at least one occurrence is mid-line, otherwise it would just restate the
  existing rhyme scheme). Results show as a list (word/line references) and as coloured
  highlighting directly in the draft, with a legend. Three grouping levels — exact sounds,
  simplified families (manner of articulation / vowel timbre), or extended families (adds
  voiced/voiceless distinctions) — with colours kept stable per theme across all three levels
  rather than reassigned by order of appearance. Also: "Exclure mots outils", a seuil (minimum
  occurrences, default 3), and "Surligner seulement les 3 plus fréquents" to keep the draft
  readable on sonorité-heavy poems. Several real coverage bugs fixed along the way: "oi"/"ui"
  and mid-word "eau"/"au" weren't recognised as vowel sounds at all; nasal vowels ("chantant",
  "jasmin"...) weren't being detected as nasal; the dictionary's phonetic alphabet (R/S/Z/J)
  didn't match the fallback heuristic's symbols (r/ʃ/ʒ/ɲ), so dictionary-covered words formed
  their own stray one-word "family" instead of joining the right group; a word's own final mute
  e was counted as an assonance with itself.

  The Guide tab got a matching new section, plus a
  reorganisation (rhymes and poem forms were each split across unrelated sections) and a
  collapsible table of contents.

  Also, in the Synonymes tab: each synonym/antonym chip now
  shows its syllable count, and a new "syllable count" dropdown filters results down to a
  given count — same style as the existing syllable filter in the Rimes tab.