Fix TOC: embed title in longtable to prevent blank first page

Move "Inhaltsverzeichnis" title into the longtable as a
multicolumn first row so it stays with the table content.
Remove duplicate header on continuation pages. Reduce header
rotation to 60 degrees with scriptsize font.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

songbook-style.sty

@@ -170,14 +170,12 @@
 
 % --- Rotated column header ---
 \newcommand{\rotheader}[1]{%
-  \begin{turn}{70}\footnotesize\textbf{#1}\end{turn}%
+  \begin{turn}{60}\scriptsize\textbf{#1}\end{turn}%
 }
 
 % --- Print the song TOC table ---
 \newcommand{\printsongtoc}{%
   \thispagestyle{fancy}%
-  {\Large\bfseries Inhaltsverzeichnis\par}%
-  \vspace{5mm}%
   \footnotesize
   \rowcolors{2}{tocrowgray}{white}%
   \begin{longtable}{%
@@ -189,21 +187,15 @@
     >{\centering\arraybackslash}p{0.07\textwidth}|%
     >{\centering\arraybackslash\columncolor{tocheadgray}}p{0.09\textwidth}%
   }
+  \multicolumn{7}{l}{\Large\bfseries Inhaltsverzeichnis} \\[2mm]
   & \rotheader{BuLiBu}
   & \rotheader{CL (gr.)}
   & \rotheader{SwA}
   & \rotheader{Barde}
   & \rotheader{LiBock}
-  & \rotheader{\normalsize Carmina\newline\normalsize Leonis} \\
+  & \rotheader{Carmina\newline Leonis} \\
   \hline
   \endfirsthead
-  & \rotheader{BuLiBu}
-  & \rotheader{CL (gr.)}
-  & \rotheader{SwA}
-  & \rotheader{Barde}
-  & \rotheader{LiBock}
-  & \rotheader{\normalsize Carmina\newline\normalsize Leonis} \\
-  \hline
   \endhead
   \InputIfFileExists{\jobname.songtoc}{}{}%
   \end{longtable}%