pitch-deck: fix timeline overlap with tip/progress badges in MilestonesSlide

Increase timeline marginTop from 14→68 so it clears the absolute-positioned
Tip and Fortschritt elements at top:36.

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

pitch-deck/components/slides/MilestonesSlide.tsx

@@ -700,7 +700,7 @@ function MilestonesInner({ t, de, sel, setSel }: {
       </div>
 
       {/* Timeline */}
-      <div style={{ position: 'relative', marginTop: 14 }}>
+      <div style={{ position: 'relative', marginTop: 68 }}>
         <Timeline onSelect={setSel} selectedId={sel?.id ?? null} t={t} de={de} />
       </div>