Fix TOC: restore page breaks and remove blank page

- Change \\* back to \\ in songtocrow to allow longtable page breaks
- Restore continuation header on subsequent TOC pages
- Use \cleardoublepage before TOC to eliminate blank page

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

songbook-style.sty

@@ -165,7 +165,7 @@
 % --- Render one TOC row ---
 % #1=title #2=BuLiBu #3=CL #4=SwA #5=Barde #6=LiBock #7=page
 \newcommand{\songtocrow}[7]{%
-  #1 & #2 & #3 & #4 & #5 & #6 & \cellcolor{tocheadgray}\textbf{#7} \\*
+  #1 & #2 & #3 & #4 & #5 & #6 & \cellcolor{tocheadgray}\textbf{#7} \\
 }
 
 % --- Rotated column header ---
@@ -196,6 +196,13 @@
   & \rotheader{Carmina\newline Leonis} \\
   \hline
   \endfirsthead
+  & \rotheader{BuLiBu}
+  & \rotheader{CL (gr.)}
+  & \rotheader{SwA}
+  & \rotheader{Barde}
+  & \rotheader{LiBock}
+  & \rotheader{Carmina\newline Leonis} \\
+  \hline
   \endhead
   \InputIfFileExists{\jobname.songtoc}{}{}%
   \end{longtable}%