✨(frontend) make summary button fixed to remain visible during scroll

ensures persistent access to table of contents by fixing button position

Signed-off-by: Cyril <c.gromoff@gmail.com>

Author: Ovgodd

src/frontend/apps/impress/src/features/docs/doc-table-content/components/TableContent.tsx

@@ -108,9 +108,10 @@ export const TableContent = () => {
       $align="center"
       $padding={isHover ? 'xs' : '0'}
       $justify="center"
-      $position="relative"
+      $position="fixed"
       aria-label={t('Summary')}
       $css={css`
+        right: 30px;
         border: 1px solid ${colorsTokens['greyscale-300']};
         overflow: hidden;
         border-radius: ${spacingsTokens['3xs']};