Fix issue #5343: [Bug]: Frontend changes cause Python unit tests workflow to fail but not frontend workflow

.github/workflows/frontend-lint.yml

@@ -0,0 +1,33 @@
+name: Lint Frontend
+
+on:
+  pull_request:
+    paths:
+      - 'frontend/**'
+      - '.github/workflows/frontend-lint.yml'
+  push:
+    branches:
+      - main
+    paths:
+      - 'frontend/**'
+      - '.github/workflows/frontend-lint.yml'
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install dependencies
+        run: cd frontend && npm ci
+
+      - name: Run TypeScript type checking
+        run: cd frontend && npx tsc --noEmit
+
+      - name: Run ESLint and Prettier
+        run: cd frontend && npm run lint

.github/workflows/frontend-test.yml

@@ -0,0 +1,33 @@
+name: Frontend Tests
+
+on:
+  pull_request:
+    paths:
+      - 'frontend/**'
+      - '.github/workflows/frontend-test.yml'
+  push:
+    branches:
+      - main
+    paths:
+      - 'frontend/**'
+      - '.github/workflows/frontend-test.yml'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install dependencies
+        run: cd frontend && npm ci
+
+      - name: Run TypeScript type checking
+        run: cd frontend && npx tsc --noEmit
+
+      - name: Run tests
+        run: cd frontend && npm run test

frontend/src/components/chat-input.tsx

@@ -82,9 +82,10 @@ export function ChatInput({
   };
 
   const handleSubmitMessage = () => {
-    if (textareaRef.current?.value) {
-      onSubmit(textareaRef.current.value);
-      textareaRef.current.value = "";
+    const textarea = textareaRef.current;
+    if (textarea?.value) {
+      onSubmit(textarea.value);
+      textarea.value = "";
     }
   };