docs: Add pre-commit hook setup instructions for type validation

Document optional local Git pre-commit hook configuration to catch
type drift before commits. Also document Husky alternative.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Docs/Web-Development.md

@@ -111,6 +111,34 @@ The script returns:
 - **Exit 2:** Backend is not accessible (set `BANGUI_BACKEND_URL` if needed)
 - **Exit 3:** Type generation failed
 
+### Pre-Commit Hook Setup (Local Development)
+
+To catch type drift locally before committing, set up a Git pre-commit hook:
+
+1. **Create `.git/hooks/pre-commit`:**
+   ```bash
+   #!/bin/bash
+   # Validate types before commit
+   cd frontend
+   npm run validate:types
+   if [ $? -ne 0 ] && [ $? -ne 2 ]; then  # Allow hook to skip if backend unavailable
+     echo "❌ Types out of sync. Run 'npm run generate:types' and commit the changes."
+     exit 1
+   fi
+   ```
+
+2. **Make it executable:**
+   ```bash
+   chmod +x .git/hooks/pre-commit
+   ```
+
+3. **Alternative: Use Husky** (if your project has Husky configured)
+   ```bash
+   npx husky add .husky/pre-commit "cd frontend && npm run validate:types"
+   ```
+
+**Note:** The pre-commit hook is optional and local only. The CI/CD pipeline will always validate types, so types cannot drift even without a local hook.
+
 ---
 
 ## 3. Type Safety in API Calls