refactor: extract audiobook dialogue merging

CHANGELOG.md

@@ -9,7 +9,7 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 
 ### Changed
 - **Audiobook cast normalization extraction.** Same-speaker post-cast merging now lives in
-  `audiobook-cast.js`, keeping deterministic segment cleanup separate from live casting orchestration.
+  `audiobook-cast.js`, including dialogue-only merging, keeping deterministic segment cleanup separate from live casting orchestration.
 - **Audiobook segmentation extraction.** Quote segmentation, conservative turn-taking, and dialogue-piece validation
   now live in `audiobook-segmentation.js`; the live casting pipeline remains compatible with the same global helpers.
 - **Rehearser voice-design extraction.** Character development, backend selection, and backend-refresh synchronization

VERSION

@@ -1 +1 @@
-1.24.39
+1.24.40

docs/ARCHITECTURE.md

@@ -37,7 +37,7 @@ Done incrementally as global-scope ordered files (no ES-module change needed)
 - ✅ `rehearser-voice-design.js` — character development, backend selection, and backend-refresh synchronization.
 - ✅ `audiobook-segmentation.js` — quote segmentation, conservative turn-taking, and dialogue-piece validation.
 - ✅ `audiobook-parse.js` — dialogue detection, dehyphenation, and speaker-heuristic constants; the casting pipeline remains in `audiobook.js`.
-- ✅ `audiobook-cast.js` — cast Markdown export, legacy page-stamping migration, and deterministic same-speaker post-cast normalization helpers; live casting remains in `audiobook.js`.
+- ✅ `audiobook-cast.js` — cast Markdown export, legacy page-stamping migration, and deterministic same-speaker/dialogue post-cast normalization helpers; live casting remains in `audiobook.js`.
 - ✅ `static/css/resource-diagnostics.css` — isolated Performance/resource diagnostic panel styles.
 - ✅ `static/css/background-jobs.css` — isolated background-job history and retry-panel styles.
 - ✅ `static/css/voice-design.css` — isolated Voice Design form, samples, and preview-match styles.

static/index.html

@@ -10,7 +10,7 @@
   <meta name="format-detection" content="telephone=no">
   <meta name="color-scheme" content="light dark">
   <meta name="theme-color" content="#2563EB">
-  <meta name="app-version" content="1.24.39">
+  <meta name="app-version" content="1.24.40">
   <link rel="manifest" href="/manifest.webmanifest">
   <link rel="icon" href="/static/icon.svg" type="image/svg+xml">
   <link rel="apple-touch-icon" href="/static/icon.svg">
@@ -27,10 +27,10 @@
 
   <!-- ── Core styles (local — no CDN dependency for first paint) ────────── -->
   <link rel="stylesheet" href="/static/vendor/mdi/materialdesignicons.min.css">
-  <link rel="stylesheet" href="/static/style.css?v=1.24.39">
-  <link rel="stylesheet" href="/static/css/resource-diagnostics.css?v=1.24.39">
-  <link rel="stylesheet" href="/static/css/background-jobs.css?v=1.24.39">
-  <link rel="stylesheet" href="/static/css/voice-design.css?v=1.24.39">
+  <link rel="stylesheet" href="/static/style.css?v=1.24.40">
+  <link rel="stylesheet" href="/static/css/resource-diagnostics.css?v=1.24.40">
+  <link rel="stylesheet" href="/static/css/background-jobs.css?v=1.24.40">
+  <link rel="stylesheet" href="/static/css/voice-design.css?v=1.24.40">
 
 
   <!-- ── Flag icons — non-blocking (loaded async, icons appear after JS) ── -->
@@ -395,7 +395,7 @@ window.toggleNavTree = function(treeId, chevronId) {
 </script>
 
 <!-- loader.js: fetches sections → loads JS modules → removes skeleton -->
-<script src="/static/loader.js?v=1.24.39"></script>
+<script src="/static/loader.js?v=1.24.40"></script>
 
 </body>
 </html>

static/js/audiobook-cast.js

@@ -76,10 +76,35 @@ function _audiobookMergeAdjacentSameSpeaker(segments) {
   return out;
 }
 
+// Merge consecutive segments spoken by the same named character. This is a
+// dialogue-only normalization pass; narration is intentionally left alone.
+function _audiobookMergeAdjacentDialogue(segments) {
+  const out = [];
+  let merged = 0;
+  for (const s of segments) {
+    if (out.length) {
+      const last = out[out.length - 1];
+      const spk = String(s.speaker || '').trim().toLowerCase();
+      const known = spk && !/^(unknown|unbekannt|narrator)$/i.test(spk);
+      if (last.type === 'dialogue' && s.type === 'dialogue' && known
+          && String(last.speaker || '').trim().toLowerCase() === spk) {
+        const a = String(last.text || '').trimEnd(), b = String(s.text || '').trimStart();
+        last.text = a + (/[.!?…»«"']$/.test(a) ? '\n\n' : ' ') + b;
+        if (!String(last.emotion || '').trim() && String(s.emotion || '').trim()) last.emotion = s.emotion;
+        merged++;
+        continue;
+      }
+    }
+    out.push(s);
+  }
+  return { segments: out, merged };
+}
+
 window.TTVC = window.TTVC || {};
 window.TTVC.audiobook = window.TTVC.audiobook || {};
 window.TTVC.audiobook.cast = {
   toMarkdown: _abCastMarkdown,
   stampPages: _abStampSegmentPages,
   mergeAdjacentSameSpeaker: _audiobookMergeAdjacentSameSpeaker,
+  mergeAdjacentDialogue: _audiobookMergeAdjacentDialogue,
 };

static/js/audiobook.js

@@ -1269,52 +1269,6 @@ function _abStampConfidence(segs) {
   return segs;
 }
 
-// Merge consecutive segments spoken by the SAME named character.
-//
-// Deliberately dialogue-only. The full merge (_audiobookMergeAdjacentSameSpeaker)
-// runs once at the end of casting, but recast and verify then reassign speakers
-// and create fresh adjacent same-speaker pairs that nothing ever merges — 213
-// of them in the measured book. Re-running the full merge there makes things
-// WORSE, because it also joins narration, and measured against the human
-// reference the caster's narration is already too coarse (median 152 chars vs
-// the human's 123) while its dialogue is slightly too fine (62 vs 65).
-// Measured effect of merging dialogue runs only: text-match failures fall from
-// 727 to 588, wrong-speaker rows from 345 to 310, and the segment count moves
-// from 2273 to 2059 against the human's 2110. Merging narration as well pushed
-// mismatches UP to 746, so this stays one-sided on purpose.
-// Unknown speakers are never merged — two adjacent Unknown lines are not
-// evidence of one speaker, they are two lines nobody has identified yet.
-function _audiobookMergeAdjacentDialogue(segments) {
-  const out = [];
-  let merged = 0;
-  for (const s of segments) {
-    if (out.length) {
-      const last = out[out.length - 1];
-      const spk = String(s.speaker || '').trim().toLowerCase();
-      const known = spk && !/^(unknown|unbekannt|narrator)$/i.test(spk);
-      if (last.type === 'dialogue' && s.type === 'dialogue' && known
-          && String(last.speaker || '').trim().toLowerCase() === spk) {
-        const a = String(last.text || '').trimEnd(), b = String(s.text || '').trimStart();
-        last.text = a + (/[.!?…»«"']$/.test(a) ? '\n\n' : ' ') + b;
-        // Emotion is deliberately NOT required to match. Requiring it blocked
-        // almost every merge (42 instead of 214) and left segmentation far from
-        // the human's: measured, same-emotion-only lands at 2230 segments and
-        // 685 text mismatches, while merging regardless lands at 2059 against
-        // the human's own 2110, with 588 mismatches and a better speaker-match
-        // rate (56.4% vs 53.8%). The cost is one emotion tag per character
-        // block instead of per chunk — but the hand-corrected reference merges
-        // these blocks too, so a human reading the scene judged one emotion
-        // sufficient. Keep the first non-empty tag rather than dropping both.
-        if (!String(last.emotion || '').trim() && String(s.emotion || '').trim()) last.emotion = s.emotion;
-        merged++;
-        continue;
-      }
-    }
-    out.push(s);
-  }
-  return { segments: out, merged };
-}
-
 function audiobookIsRouterModel(model) {
   return /^auto[-_ ]?router/i.test(String(model || '').trim());
 }