End-dominated vowel fusion; annotation lines render dimmer

- Same-vowel perfect families fuse when both live at line ends:
  blood/mud + thugs/drugs (+does/love/enough) read as Kanye's one AH
  chain; mid-line families keep their codas distinct
- Annotation lines (#, [, ( starts) render in a dim ink — the
  highlight layer now owns the glyph color (textarea text is
  transparent over it), in the editor and the PNG export

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app.py

@@ -948,6 +948,9 @@ def analyze(draft: Draft):
             i = parent[i]
         return i
 
+    def _endy(gi):
+        return sum(t["is_end"] for t in raw_groups[gi]["toks"]) >= 2
+
     for ai in range(len(sv)):
         for bi in range(ai + 1, len(sv)):
             gi, (va, ca) = sv[ai]
@@ -955,7 +958,11 @@ def analyze(draft: Draft):
             if va != vb or ca == cb:
                 continue
             s, l = (ca, cb) if len(ca) < len(cb) else (cb, ca)
-            if l[:len(s)] == s or l[len(l) - len(s):] == s:
+            nested = l[:len(s)] == s or l[len(l) - len(s):] == s
+            # end-dominated families rhyme on their bare vowel, the way
+            # lone endings always could (blood/mud + thugs/drugs — the
+            # Kanye chorus chain); mid-line families keep their codas
+            if nested or (_endy(gi) and _endy(gj)):
                 parent[find(gi)] = find(gj)
 
     clusters = defaultdict(list)

static/index.html

@@ -110,9 +110,10 @@
   .editor-shell.rhythm #editor { line-height: 2.35; }
   #highlight {
     pointer-events: none;
-    color: transparent;
+    color: var(--ink);
     z-index: 1;
   }
+  #highlight .anno { color: #6a5f52; }
   #stresslayer {
     pointer-events: none;
     color: transparent;
@@ -126,8 +127,9 @@
   }
   #editor {
     background: transparent;
-    color: var(--ink);
+    color: transparent;
     caret-color: var(--accent);
+    &::selection { background: rgba(232,129,74,0.22); }
     resize: none;
     z-index: 2;
     outline: none;
@@ -902,7 +904,7 @@ document.getElementById('exportBtn').addEventListener('click', async ()=>{
         x.globalAlpha = 1;
       });
     }
-    x.fillStyle = ink;
+    x.fillStyle = /^\s*[#([]/.test(line) ? '#6a5f52' : ink;
     x.fillText(line, PAD, y);
     if(rhythm && fresh){
       const spans = (analysis.stress.filter(s=>s.l===i)).sort((a,b)=>a.s-b.s);

tests/test_rhymes.py

@@ -630,3 +630,15 @@ def test_paren_words_highlight_but_never_end():
     ends = {res["lines"][t["l"]][t["s"]:t["e"]].lower()
             for t in res["tokens"] if t["end"] and not t["ph"]}
     assert "greed" not in ends
+
+
+def test_end_dominated_vowel_families_fuse():
+    # the Kanye chorus chain: blood/mud (AH D) and thugs/drugs (AH G Z)
+    # are one AH family when both live at line ends
+    text = ("Shower us with your love\n"
+            "Wash us in the blood\n"
+            "Drop this for the thugs\n"
+            "Know I grew up in the mud\n"
+            "The top is not enough\n"
+            "No choice, sellin' drugs")
+    group_with(text, "love", "blood", "thugs", "mud", "enough", "drugs")