diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e0736ff3..7434cf8b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,10 @@ on:
   push:
     branches: [main]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
 
diff --git a/.lintstagedrc b/.lintstagedrc
index e6a08888..5b1260b7 100644
--- a/.lintstagedrc
+++ b/.lintstagedrc
@@ -1,5 +1,5 @@
 {
-  "**/*.{js,mjs,ts,tsx,md,mdx,json.yml}": [
+  "**/*.{js,mjs,jsx,ts,tsx,md,mdx,json,yml}": [
     "eslint --fix",
     "prettier --check --write"
   ],
diff --git a/eslint.config.mjs b/eslint.config.mjs
index c79a995e..4222ab72 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -10,6 +10,14 @@ export default [
       globals: globals.node,
     },
   },
+  {
+    files: ['**/*.jsx'],
+    languageOptions: {
+      parserOptions: { ecmaFeatures: { jsx: true } },
+      // SERVER/CLIENT are compile-time defines from doc-kit, not real globals.
+      globals: { ...globals.browser, SERVER: 'readonly', CLIENT: 'readonly' },
+    },
+  },
   {
     ignores: ['node_modules/', 'out/', '.cache/', 'webpack/', 'pages/api'],
   },