feat: use Worte/Weise labels and render metadata at page bottom (Closes #5)

Add metadata_labels ("abbreviated"/"german") and metadata_position
("top"/"bottom") options to LayoutConfig. German labels use "Worte:" and
"Weise:" instead of "T:" and "M:", with "Worte und Weise:" when lyricist
and composer are the same person. Metadata at bottom position renders
after notes with word-wrapping. MeasurementEngine accounts for two-line
metadata in German label mode.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

renderer-pdf/src/main/kotlin/de/pfadfinder/songbook/renderer/pdf/PdfBookRenderer.kt

@@ -104,6 +104,8 @@ class PdfBookRenderer : BookRenderer {
     ) {
         var y = contentTop
 
+        val renderMetaAtBottom = config.layout.metadataPosition == "bottom"
+
         if (pageIndex == 0) {
             // Render title
             val titleFont = fontMetrics.getBaseFont(config.fonts.title)
@@ -116,20 +118,22 @@ class PdfBookRenderer : BookRenderer {
             cb.endText()
             y -= titleSize * 1.5f
 
-            // Render metadata line (composer/lyricist)
-            val metaParts = mutableListOf<String>()
-            song.composer?.let { metaParts.add("M: $it") }
-            song.lyricist?.let { metaParts.add("T: $it") }
-            if (metaParts.isNotEmpty()) {
-                val metaFont = fontMetrics.getBaseFont(config.fonts.metadata)
-                val metaSize = config.fonts.metadata.size
-                cb.beginText()
-                cb.setFontAndSize(metaFont, metaSize)
-                cb.setColorFill(Color.GRAY)
-                cb.setTextMatrix(leftMargin, y - metaSize)
-                cb.showText(metaParts.joinToString(" / "))
-                cb.endText()
-                y -= metaSize * 1.8f
+            // Render metadata line (composer/lyricist) - at top position only
+            if (!renderMetaAtBottom) {
+                val metaParts = buildMetadataLines(song, config)
+                if (metaParts.isNotEmpty()) {
+                    val metaFont = fontMetrics.getBaseFont(config.fonts.metadata)
+                    val metaSize = config.fonts.metadata.size
+                    for (metaLine in metaParts) {
+                        cb.beginText()
+                        cb.setFontAndSize(metaFont, metaSize)
+                        cb.setColorFill(Color.GRAY)
+                        cb.setTextMatrix(leftMargin, y - metaSize)
+                        cb.showText(metaLine)
+                        cb.endText()
+                        y -= metaSize * 1.8f
+                    }
+                }
             }
 
             // Render key and capo
@@ -242,6 +246,28 @@ class PdfBookRenderer : BookRenderer {
             }
         }
 
+        // Render metadata at bottom of song page (if configured)
+        if (renderMetaAtBottom && pageIndex == 0) {
+            val metaParts = buildMetadataLines(song, config)
+            if (metaParts.isNotEmpty()) {
+                y -= 4f
+                val metaFont = fontMetrics.getBaseFont(config.fonts.metadata)
+                val metaSize = config.fonts.metadata.size
+                for (metaLine in metaParts) {
+                    val wrappedLines = wrapText(metaLine, metaFont, metaSize, contentWidth)
+                    for (wrappedLine in wrappedLines) {
+                        cb.beginText()
+                        cb.setFontAndSize(metaFont, metaSize)
+                        cb.setColorFill(Color.GRAY)
+                        cb.setTextMatrix(leftMargin, y - metaSize)
+                        cb.showText(wrappedLine)
+                        cb.endText()
+                        y -= metaSize * 1.5f
+                    }
+                }
+            }
+        }
+
         // Render reference book footer on the last page of the song
         if (config.referenceBooks.isNotEmpty() && song.references.isNotEmpty()) {
             val isLastPage = (pageIndex == 0) // For now, all content renders on page 0
@@ -255,6 +281,35 @@ class PdfBookRenderer : BookRenderer {
         }
     }
 
+    /**
+     * Build metadata lines based on configured label style.
+     * Returns a list of lines to render (may be empty).
+     */
+    private fun buildMetadataLines(song: Song, config: BookConfig): List<String> {
+        val useGerman = config.layout.metadataLabels == "german"
+        val lines = mutableListOf<String>()
+
+        if (useGerman) {
+            // German labels: "Worte und Weise:" when same person, otherwise separate
+            if (song.lyricist != null && song.composer != null && song.lyricist == song.composer) {
+                lines.add("Worte und Weise: ${song.lyricist}")
+            } else {
+                song.lyricist?.let { lines.add("Worte: $it") }
+                song.composer?.let { lines.add("Weise: $it") }
+            }
+        } else {
+            // Abbreviated labels on a single line
+            val parts = mutableListOf<String>()
+            song.composer?.let { parts.add("M: $it") }
+            song.lyricist?.let { parts.add("T: $it") }
+            if (parts.isNotEmpty()) {
+                lines.add(parts.joinToString(" / "))
+            }
+        }
+
+        return lines
+    }
+
     /**
      * Renders reference book abbreviations and page numbers as a footer row
      * at the bottom of the song page, above the page number.