addressing nits

Author: angiejones

src/lib/accessibility-snapshot.js

@@ -43,7 +43,7 @@ function walk(el) {
     if (role) node.role = role;
     if (name) node.name = name;
     if (el.id) node.id = el.id;
-    if (tag.match(/^H[1-6]$/)) node.level = parseInt(tag[1]);
+    if (/^H[1-6]$/.test(tag)) node.level = parseInt(tag[1], 10);
     if (el.href) node.href = el.href;
     if (el.disabled) node.disabled = true;
     if (el.checked) node.checked = true;

src/lib/server.js

@@ -880,7 +880,7 @@ server.registerResource(
             //-32002 is not in the SDK but is noted in the MCP specification: 
             // https://modelcontextprotocol.io/specification/2025-11-25/server/resources#error-handling
             if (!driver) throw new McpError(-32002, "No active browser session. Start a browser first.");
-            const tree = await driver.executeScript(accessibilitySnapshotScript);
+            const tree = await driver.executeScript(accessibilitySnapshotScript) || {};
             return { contents: [{ uri: uri.href, mimeType: "application/json", text: JSON.stringify(tree, null, 2) }] };
         } catch (e) {
             if (e instanceof McpError) throw e;