Fix TypeScript errors for Netlify Identity integration

- Add proper TypeScript types for Netlify Identity in env.d.ts
- Define NetlifyUser and NetlifyIdentity interfaces
- Fix ESLint errors by removing 'any' types
- Add optional chaining for safe access
- Apply code formatting with Prettier

All TypeScript, ESLint, and Prettier checks now pass successfully.

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

DECAP_CMS_SETUP.md

@@ -1,11 +1,13 @@
 # Decap CMS Setup for ARC Website
 
 ## Overview
+
 This website uses Decap CMS (formerly Netlify CMS) for content management. It allows authorized users to create, edit, and manage blog posts through a web interface.
 
 ## Setup Instructions
 
 ### 1. Enable Netlify Identity
+
 1. Go to your Netlify dashboard
 2. Navigate to your site settings
 3. Go to "Identity" tab
@@ -16,17 +18,20 @@ This website uses Decap CMS (formerly Netlify CMS) for content management. It al
    - Git Gateway: Enable this service
 
 ### 2. Configure Git Gateway
+
 1. In your site's Identity settings
 2. Go to "Services" tab
 3. Enable "Git Gateway"
 4. This allows Decap CMS to commit directly to your GitHub repository
 
 ### 3. Invite Users
+
 1. In Identity tab, click "Invite users"
 2. Enter email addresses of content editors
 3. They will receive invitation emails
 
 ### 4. Access the CMS
+
 - CMS URL: `https://your-site.netlify.app/admin/`
 - Users can log in with their invited credentials
 - The CMS will redirect to `/decapcms/` for the actual interface
@@ -34,11 +39,13 @@ This website uses Decap CMS (formerly Netlify CMS) for content management. It al
 ## Features
 
 ### Turkish Interface
+
 - All field labels are in Turkish
 - Configured for Turkish content creators
 - Default author set to "TA1SPH"
 
 ### Blog Post Management
+
 - Create new blog posts
 - Edit existing posts
 - Upload featured images
@@ -46,6 +53,7 @@ This website uses Decap CMS (formerly Netlify CMS) for content management. It al
 - Markdown editor for content
 
 ### File Structure
+
 - Blog posts are stored in `src/data/post/`
 - Images are stored in `src/assets/images/`
 - Posts use the format: `YYYY-MM-DD-slug.md`
@@ -53,16 +61,20 @@ This website uses Decap CMS (formerly Netlify CMS) for content management. It al
 ## Configuration Files
 
 ### `/public/decapcms/config.yml`
+
 Main configuration file that defines:
+
 - Backend (Git Gateway)
 - Collections (Blog posts)
 - Fields and their types
 - Media handling
 
 ### `/public/decapcms/index.html`
+
 The CMS interface HTML file
 
 ### `/public/_redirects`
+
 Netlify redirect rules for admin routing
 
 ## Usage
@@ -85,10 +97,12 @@ Netlify redirect rules for admin routing
 ## Troubleshooting
 
 ### Common Issues:
+
 1. **Can't log in**: Check if Identity is enabled and user is invited
 2. **Can't save posts**: Ensure Git Gateway is enabled
 3. **Images not uploading**: Check media folder permissions
 4. **Changes not deploying**: Verify GitHub Actions workflow
 
 ### Support
-For technical issues, contact the development team or check the Decap CMS documentation at https://decapcms.org/docs/
+
+For technical issues, contact the development team or check the Decap CMS documentation at https://decapcms.org/docs/