fix: correct hyphenation of URLs (port upstream PR #1068)

Add '/' as explicit hyphen delimiter and relax the alphabetic-surround
requirement for '/' and '-' in buildExplicitBreakInfos so URL path
segments can be line-wrapped. Includes repeated-separator guard to
prevent breaks between consecutive identical separators (e.g. "http://").

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/Epub/Epub/hyphenation/HyphenationCommon.cpp

@@ -106,6 +106,7 @@ bool isAsciiDigit(const uint32_t cp) { return cp >= '0' && cp <= '9'; }
 
 bool isExplicitHyphen(const uint32_t cp) {
   switch (cp) {
+    case '/':
     case '-':
     case 0x00AD:  // soft hyphen
     case 0x058A:  // Armenian hyphen

lib/Epub/Epub/hyphenation/Hyphenator.cpp

@@ -35,13 +35,17 @@ size_t byteOffsetForIndex(const std::vector<CodepointInfo>& cps, const size_t in
 std::vector<Hyphenator::BreakInfo> buildExplicitBreakInfos(const std::vector<CodepointInfo>& cps) {
   std::vector<Hyphenator::BreakInfo> breaks;
 
-  // Scan every codepoint looking for explicit/soft hyphen markers that are surrounded by letters.
   for (size_t i = 1; i + 1 < cps.size(); ++i) {
     const uint32_t cp = cps[i].value;
-    if (!isExplicitHyphen(cp) || !isAlphabetic(cps[i - 1].value) || !isAlphabetic(cps[i + 1].value)) {
+    if (!isExplicitHyphen(cp)) {
+      continue;
+    }
+    if ((cp == '/' || cp == '-') && cps[i + 1].value == cp) {
+      continue;
+    }
+    if (cp != '/' && cp != '-' && (!isAlphabetic(cps[i - 1].value) || !isAlphabetic(cps[i + 1].value))) {
       continue;
     }
-    // Offset points to the next codepoint so rendering starts after the hyphen marker.
     breaks.push_back({cps[i + 1].byteOffset, isSoftHyphen(cp)});
   }