refactor(web): stack tools sections vertically for better alignment

Replace 2-column grid with full-width stacked sections so tool icons
flow naturally in one line per group with consistent spacing.

Author: Movm

apps/web/src/features/workplace/WorkplacePage.tsx

@@ -48,16 +48,15 @@ const WorkplacePage = () => {
 
         <NotebooksSection />
 
-        <div className="md:grid md:grid-cols-2 md:gap-lg mb-xl">
-          <section>
-            <SectionHeader title="Weitere Tools" />
-            <ToolsSection />
-          </section>
-          <section>
-            <SectionHeader title="Experimentelle Tools" />
-            <ExperimentalToolsSection />
-          </section>
-        </div>
+        <section className="mb-xl">
+          <SectionHeader title="Weitere Tools" />
+          <ToolsSection />
+        </section>
+
+        <section className="mb-xl">
+          <SectionHeader title="Experimentelle Tools" />
+          <ExperimentalToolsSection />
+        </section>
       </PageContainer>
     </ErrorBoundary>
   );