feat(lint): add biome formatter and linter, husky and lint-staged

This commit adds the Biome formatter and linter to replace Prettier, including:

- Add biome.json config file
- Add pre-commit hook with Husky
- Configure GitHub Action to run Biome checks
- Apply Biome formatting rules to codebase
- Remove Prettier dependencies

src/utils/githubChecksums.ts

@@ -3,29 +3,25 @@
  * Returns a mapping from filename to checksum.
  */
 export async function getChecksums() {
-  const res = await fetch(
-    'https://api.github.com/repos/zen-browser/desktop/releases/latest',
-    {
-      headers: {
-        Accept: 'application/vnd.github+json',
-        'X-GitHub-Api-Version': '2022-11-28',
-        'User-Agent': 'zen-browser-checksum-fetcher',
-      },
+  const res = await fetch("https://api.github.com/repos/zen-browser/desktop/releases/latest", {
+    headers: {
+      Accept: "application/vnd.github+json",
+      "X-GitHub-Api-Version": "2022-11-28",
+      "User-Agent": "zen-browser-checksum-fetcher",
     },
-  )
-  if (!res.ok)
-    throw new Error('Failed to fetch GitHub release: ' + res.statusText)
-  const data = await res.json()
-  const body = data.body as string
+  });
+  if (!res.ok) throw new Error(`Failed to fetch GitHub release: ${res.statusText}`);
+  const data = await res.json();
+  const body = data.body as string;
 
   // Extract the checksum block
-  const match = body.match(/File Checksums \(SHA-256\)[\s\S]*?```([\s\S]*?)```/)
-  const checksums: Record<string, string> = {}
-  if (match && match[1]) {
-    match[1].split('\n').forEach((line) => {
-      const [hash, filename] = line.trim().split(/\s+/, 2)
-      if (hash && filename) checksums[filename] = hash
-    })
+  const match = body.match(/File Checksums \(SHA-256\)[\s\S]*?```([\s\S]*?)```/);
+  const checksums: Record<string, string> = {};
+  if (match?.[1]) {
+    for (const line of match[1].split("\n")) {
+      const [hash, filename] = line.trim().split(/\s+/, 2);
+      if (hash && filename) checksums[filename] = hash;
+    }
   }
-  return checksums
+  return checksums;
 }