fix(ui): comprehensive mobile optimizations across homepage and blocks

- fix: bottom nav and footer padding collision
- fix: reveal animation flickering (Certificates, SubCompanyTiles)
- fix: tooltip flyout overflow on mobile in Germany map
- fix: flex direction for 'Projekt anfragen' and Service Detail icons
- fix: text alignment and spacing issues in ReferencesSlider
- fix: reduce excessive whitespace above footer

components/blocks/SubCompanyTiles.tsx

@@ -85,7 +85,7 @@ export function SubCompanyTiles(props: SubCompanyTilesProps) {
             variants={containerVariants}
             initial="hidden"
             whileInView="visible"
-            viewport={{ once: true, margin: "-50px" }}
+            viewport={{ once: true, amount: 0.1 }}
           >
           {companiesData.map((company: any, index: number) => {
             const isCurrent = company.title.toUpperCase() === 'E-TIB GMBH';