fix(pdf): fix page ordering, Win-1252 quotes, and chapter header cleanup

Three fixes to PDF chapter extraction quality:

1. Page ordering: parse page number from pdfcpu filename (out_Content_page_N.txt)
   instead of using lexicographic sort index — fixes chapters bleeding into each
   other (e.g. Prologue text appearing inside Chapter 1).

2. Windows-1252 chars: map bytes 0x91-0x9F to proper Unicode (curly quotes U+2018/
   U+2019/U+201C/U+201D, em-dash U+2014, etc.) instead of raw Latin-1 control
   bytes that rendered as ◆ in the browser.

3. Chapter header cleanup: skip the first page of each bookmark range (decorative
   title art page) and strip any run-on title fragment at the start of the first
   body page (e.g. 'for New Journeys!I stood atop...' → 'I stood atop...'). The
   remaining sentence truncation is a fundamental limitation of this PDF's
   PUA-encoded body font (C2_1/Literata) — those glyphs cannot be decoded without
   the publisher's private ToUnicode mapping.

backend/internal/storage/import.go

@@ -186,17 +186,19 @@ func parsePDF(data []byte) ([]bookstore.Chapter, error) {
 		return nil, fmt.Errorf("PDF has no content pages")
 	}
 
-	// Sort entries by filename so index == page number - 1.
-	sort.Slice(entries, func(i, j int) bool { return entries[i].Name() < entries[j].Name() })
-
-	// Build page-index → extracted text map.
+	// pdfcpu names files "out_Content_page_N.txt" — parse the page number
+	// from the filename so the map is correct regardless of lexicographic order.
 	pageTexts := make(map[int]string, len(entries))
-	for idx, e := range entries {
+	for _, e := range entries {
+		pageNum := pageNumFromFilename(e.Name())
+		if pageNum <= 0 {
+			continue
+		}
 		raw, readErr := os.ReadFile(tmpDir + "/" + e.Name())
 		if readErr != nil {
 			continue
 		}
-		pageTexts[idx+1] = extractTextFromContentStream(raw)
+		pageTexts[pageNum] = fixWin1252(extractTextFromContentStream(raw))
 	}
 
 	// Try to use bookmarks (outline) for chapter structure.
@@ -208,9 +210,15 @@ func parsePDF(data []byte) ([]bookstore.Chapter, error) {
 		}
 	}
 
-	// Fallback: concatenate all page texts and split by heading patterns.
+	// Fallback: concatenate all page texts in page order and split by heading patterns.
 	var sb strings.Builder
-	for p := 1; p <= len(entries); p++ {
+	maxPage := 0
+	for p := range pageTexts {
+		if p > maxPage {
+			maxPage = p
+		}
+	}
+	for p := 1; p <= maxPage; p++ {
 		sb.WriteString(pageTexts[p])
 		sb.WriteByte('\n')
 	}
@@ -264,14 +272,21 @@ func chaptersFromBookmarks(bookmarks []pdfcpu.Bookmark, pageTexts map[int]string
 			continue
 		}
 		// Gather text for all pages in this bookmark's range.
+		// The first page of each chapter is typically a decorative title page
+		// (chapter number, subtitle art, series title) — skip it and start
+		// from PageFrom+1 so the content begins with actual story text.
+		bodyStart := bm.PageFrom + 1
+		if bodyStart > bm.PageThru {
+			bodyStart = bm.PageFrom // single-page section, use it
+		}
 		var sb strings.Builder
-		for p := bm.PageFrom; p <= bm.PageThru; p++ {
+		for p := bodyStart; p <= bm.PageThru; p++ {
 			if t, ok := pageTexts[p]; ok {
 				sb.WriteString(t)
 				sb.WriteByte('\n')
 			}
 		}
-		text := strings.TrimSpace(sb.String())
+		text := cleanChapterText(strings.TrimSpace(sb.String()))
 		if len(text) < 50 {
 			continue // skip nearly-empty sections
 		}
@@ -285,6 +300,152 @@ func chaptersFromBookmarks(bookmarks []pdfcpu.Bookmark, pageTexts map[int]string
 	return chapters
 }
 
+// cleanChapterText removes decorative header fragments that sometimes appear
+// at the start of the first body page when the chapter subtitle is printed
+// at the top of that page (e.g. "for New Journeys!I stood atop the roof...").
+//
+// It strips any prefix text up to and including the last '!' or '?' that is
+// immediately followed by a capital letter on the same line (a run-on from the
+// title art), and removes short leading lines (< 40 chars) that look like
+// title/header text rather than story content.
+func cleanChapterText(text string) string {
+	lines := strings.Split(text, "\n")
+
+	// Find first line that is substantive story content.
+	// Strategy: skip short lines at the top. The first line >= 40 chars
+	// OR starting with an opening quote is the start of the story.
+	start := 0
+	for i, raw := range lines {
+		line := strings.TrimSpace(raw)
+		if line == "" {
+			start = i + 1
+			continue
+		}
+		// Long enough to be a real sentence fragment from a body page.
+		if len(line) >= 40 || strings.HasPrefix(line, "\u201C") || strings.HasPrefix(line, "\"") {
+			start = i
+			break
+		}
+		// Short line — if it ends with '!' or '?' and the NEXT non-empty
+		// token on the SAME line (run-on) starts a sentence, strip it.
+		// This catches "for New Journeys!I stood atop..." on one line.
+		start = i + 1 // tentatively skip this short line
+	}
+
+	result := strings.TrimSpace(strings.Join(lines[start:], "\n"))
+
+	// Strip any run-on title fragment at the very start of the first line.
+	// Pattern: something ending with '!' or '?' immediately before a capital letter.
+	// e.g. "for New Journeys!I stood..." → "I stood..."
+	if len(result) > 0 {
+		// Find last '!' or '?' in the first 80 bytes that is followed by [A-Z"].
+		firstLine := result
+		if nl := strings.Index(firstLine, "\n"); nl >= 0 {
+			firstLine = firstLine[:nl]
+		}
+		for i, c := range firstLine {
+			if (c == '!' || c == '?') && i+1 < len(firstLine) {
+				next := rune(firstLine[i+1])
+				if (next >= 'A' && next <= 'Z') || next == '\u201C' || next == '"' {
+					// Strip up to and including this '!'/'?'
+					result = strings.TrimSpace(result[i+1:])
+					break
+				}
+			}
+		}
+	}
+
+	if result == "" {
+		return text
+	}
+	return result
+}
+
+// pageNumFromFilename extracts the page number from a pdfcpu content-stream
+// filename like "out_Content_page_42.txt". Returns 0 if not parseable.
+func pageNumFromFilename(name string) int {
+	// Strip directory prefix and extension.
+	base := name
+	if idx := strings.LastIndex(base, "/"); idx >= 0 {
+		base = base[idx+1:]
+	}
+	if idx := strings.LastIndex(base, "."); idx >= 0 {
+		base = base[:idx]
+	}
+	// Find last "_" and parse the number after it.
+	if idx := strings.LastIndex(base, "_"); idx >= 0 {
+		n, err := strconv.Atoi(base[idx+1:])
+		if err == nil && n > 0 {
+			return n
+		}
+	}
+	return 0
+}
+
+// win1252ToUnicode maps the Windows-1252 control range 0x80–0x9F to the
+// Unicode characters they actually represent in that encoding.
+// Standard Latin-1 maps these bytes to control characters; Win-1252 maps
+// them to typographic symbols that appear in publisher PDFs.
+var win1252ToUnicode = map[byte]rune{
+	0x80: '\u20AC', // €
+	0x82: '\u201A', // ‚
+	0x83: '\u0192', // ƒ
+	0x84: '\u201E', // „
+	0x85: '\u2026', // …
+	0x86: '\u2020', // †
+	0x87: '\u2021', // ‡
+	0x88: '\u02C6', // ˆ
+	0x89: '\u2030', // ‰
+	0x8A: '\u0160', // Š
+	0x8B: '\u2039', // ‹
+	0x8C: '\u0152', // Œ
+	0x8E: '\u017D', // Ž
+	0x91: '\u2018', // ' (left single quotation mark)
+	0x92: '\u2019', // ' (right single quotation mark / apostrophe)
+	0x93: '\u201C', // " (left double quotation mark)
+	0x94: '\u201D', // " (right double quotation mark)
+	0x95: '\u2022', // • (bullet)
+	0x96: '\u2013', // – (en dash)
+	0x97: '\u2014', // — (em dash)
+	0x98: '\u02DC', // ˜
+	0x99: '\u2122', // ™
+	0x9A: '\u0161', // š
+	0x9B: '\u203A', // ›
+	0x9C: '\u0153', // œ
+	0x9E: '\u017E', // ž
+	0x9F: '\u0178', // Ÿ
+}
+
+// fixWin1252 replaces Windows-1252 specific bytes (0x80–0x9F) in a string
+// that was decoded as raw Latin-1 bytes with their proper Unicode equivalents.
+func fixWin1252(s string) string {
+	// Fast path: if no bytes in 0x80–0x9F range, return unchanged.
+	needsFix := false
+	for i := 0; i < len(s); i++ {
+		b := s[i]
+		if b >= 0x80 && b <= 0x9F {
+			needsFix = true
+			break
+		}
+	}
+	if !needsFix {
+		return s
+	}
+	var sb strings.Builder
+	sb.Grow(len(s))
+	for i := 0; i < len(s); i++ {
+		b := s[i]
+		if b >= 0x80 && b <= 0x9F {
+			if r, ok := win1252ToUnicode[b]; ok {
+				sb.WriteRune(r)
+				continue
+			}
+		}
+		sb.WriteByte(b)
+	}
+	return sb.String()
+}
+
 // extractTextFromContentStream parses a raw PDF content stream and extracts
 // readable text from Tj and TJ operators.
 //