chore(deps): update dependency typescript to ~5.9.0 (#36212)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: diondiondion <mail@diondiondion.com>

app/javascript/mastodon/components/blurhash.tsx

@@ -30,9 +30,12 @@ const Blurhash: React.FC<Props> = ({
     try {
       const pixels = decode(hash, width, height);
       const ctx = canvas.getContext('2d');
-      const imageData = new ImageData(pixels, width, height);
+      const imageData = ctx?.createImageData(width, height);
+      imageData?.data.set(pixels);
 
-      ctx?.putImageData(imageData, 0, 0);
+      if (imageData) {
+        ctx?.putImageData(imageData, 0, 0);
+      }
     } catch (err) {
       console.error('Blurhash decoding failure', { err, hash });
     }

app/javascript/mastodon/components/hashtag_bar.tsx

@@ -33,7 +33,7 @@ function isNodeLinkHashtag(element: Node): element is HTMLLinkElement {
   return (
     element instanceof HTMLAnchorElement &&
     // it may be a <a> starting with a hashtag
-    (element.textContent?.[0] === '#' ||
+    (element.textContent.startsWith('#') ||
       // or a #<a>
       element.previousSibling?.textContent?.[
         element.previousSibling.textContent.length - 1