Simplify: strip clock clutter, drop 3x3-system's decorative dot-grid icon

Lebensuhr clock: each of the 8 points had 3 stacked text lines (age,
time, vorm./nachm.) plus a leader line — too much text crammed
around a small dial. Down to just the age number per point; the
matching time is one glance away in the table.

3x3-system: removed the IconGrid3x3 decorative mark per explicit
feedback that it added nothing.

app/3x3-system/page.tsx

@@ -89,20 +89,6 @@ function IconShield() {
   );
 }
 
-// Small decorative mark — same role the clock face plays on
-// /lebensuhr/page.tsx (a page-identity graphic, not carrying any
-// information of its own). A literal 3×3 dot grid.
-function IconGrid3x3() {
-  const positions = [0, 1, 2].flatMap((row) => [0, 1, 2].map((col) => [row, col] as const));
-  return (
-    <svg width="44" height="44" viewBox="0 0 44 44" aria-hidden="true">
-      {positions.map(([row, col]) => (
-        <circle key={`${row}-${col}`} cx={7 + col * 15} cy={7 + row * 15} r="4" fill="var(--color-brand)" />
-      ))}
-    </svg>
-  );
-}
-
 const categories = [
   { icon: <IconTarget />, label: "Verantwortung", desc: "Etwas, das erledigt werden muss und für das du Verantwortung trägst." },
   { icon: <IconTrendingUp />, label: "Fortschritt", desc: "Etwas, das dich beruflich oder persönlich ein Stück weiterbringt." },
@@ -185,12 +171,9 @@ export default function DreiXDreiSystemPage() {
         {/* Full-width band, same structural role AND same icon-above-text/
             StepArrow row treatment as /7-tage-klarheits-check's "So
             funktioniert" section and /lebensuhr's phase row — a plain
-            3-card grid here read out of place next to those. IconGrid3x3
-            stays as this page's own identity graphic, paralleling
-            /lebensuhr's clock face. */}
+            3-card grid here read out of place next to those. */}
         <section className="bg-bg-muted w-full py-10 lg:py-14">
           <div className="px-8 lg:px-[5rem] max-w-[1280px] mx-auto flex flex-col items-center gap-10">
-            <IconGrid3x3 />
             <RevealGroup className="flex flex-col lg:flex-row items-center lg:items-start gap-8 lg:gap-2 w-full">
               {categories.flatMap((c, i) => [
                 <RevealItem key={c.label} className="group flex flex-col items-center gap-4 lg:gap-5 flex-1 min-w-0">