fix(techdocs): Update keyboard focus on when clicking hash links

Signed-off-by: logonoff <git@logonoff.co>

.changeset/open-lands-shop.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-techdocs': patch
+---
+
+Update keyboard focus on when clicking hash links. This fixes the issue where the "skip to content" link rendered by Material MkDocs isn't focused when used.

plugins/techdocs/src/reader/components/TechDocsReaderPageContent/dom.tsx

@@ -229,6 +229,13 @@ export const useTechDocsReaderDom = (
                 transformedElement
                   ?.querySelector(`[id="${parsedUrl.hash.slice(1)}"]`)
                   ?.scrollIntoView();
+
+                // Focus first focusable element in the target section
+                (
+                  transformedElement
+                    ?.querySelector(`[id="${parsedUrl.hash.slice(1)}"]`)
+                    ?.querySelector('a, button, [tabindex]') as HTMLElement
+                )?.focus();
               }
             } else {
               if (modifierActive) {