refactor(svg): reuse renderHeader in auto theme renderer

Author: VirenSumbly

lib/svg/generator.ts

@@ -294,13 +294,7 @@ function generateAutoThemeSVG(
   fill="none"
   role="img"
 >
-  <title>CommitPulse Stats for ${safeUser} </title>
-  <desc>
-    ${params.user || 'This user'} has ${stats.totalContributions} total contributions and a longest streak of ${stats.longestStreak} days.
-  </desc>
-  <defs>
-    <filter id="glow" x="-50%" y="-50%" width="200%" height="200%"><feGaussianBlur stdDeviation="${fs(5)}" result="blur" /><feComposite in="SourceGraphic" in2="blur" operator="over" /></filter>
-  </defs>
+  ${renderHeader(safeUser, stats, sf)}
 
   <style>
   @import url('https://fonts.googleapis.com/css2?family=Fira+Code&amp;family=JetBrains+Mono&amp;family=Roboto&amp;display=swap');