Refactor JavaScript code into separate modules for improved organization and maintainability

- Moved inline JavaScript from index.php to app.js, video-player.js, chat.js, api.js, and ui-controls.js
- Ensured all functionality remains intact while enhancing code structure
- Updated UI_UPDATE.MD to reflect completion of JavaScript separation tasks

UI_UPDATE.MD

@@ -54,40 +54,40 @@ Always come back and update UI_UPDATE.MD once complete with task and task item.
 ### Sub-task 1.2: JavaScript Separation and Organization
 
 #### 1.2.1: JavaScript Code Identification
-- [ ] Locate all JavaScript code within `<script>` tags in index.php
+- [x] Locate all JavaScript code within `<script>` tags in index.php
-- [ ] Identify JavaScript functions, event handlers, and global functions
+- [x] Identify JavaScript functions, event handlers, and global functions
-- [ ] Map dependencies between different JavaScript sections
+- [x] Map dependencies between different JavaScript sections
-- [ ] Document any PHP- generated JavaScript content
+- [x] Document any PHP- generated JavaScript content
 
 #### 1.2.2: Core App.js Structure Creation
-- [ ] Create new app.js main file
+- [x] Create new app.js main file
-- [ ] Define application configuration object
+- [x] Define application configuration object
-- [ ] Set up basic module loading structure
+- [x] Set up basic module loading structure
-- [ ] Implement global error handling and logging
+- [x] Implement global error handling and logging
 
 #### 1.2.3: Video Player Module Extraction
-- [ ] Extract Video.js initialization code into video-player.js
+- [x] Extract Video.js initialization code into video-player.js
-- [ ] Separate video control functions
+- [x] Separate video control functions
-- [ ] Move stream status management logic
+- [x] Move stream status management logic
-- [ ] Maintain error handling for video playback
+- [x] Maintain error handling for video playback
 
 #### 1.2.4: Chat System Module Creation
-- [ ] Extract chat functionality into chat.js
+- [x] Extract chat functionality into chat.js
-- [ ] Separate message handling and UI updates
+- [x] Separate message handling and UI updates
-- [ ] Move user authentication and admin functions
+- [x] Move user authentication and admin functions
-- [ ] Implement event delegation for chat interactions
+- [x] Implement event delegation for chat interactions
 
 #### 1.2.5: UI Controls Module Development
-- [ ] Extract UI toggle and control functions into ui-controls.js
+- [x] Extract UI toggle and control functions into ui-controls.js
-- [ ] Separate keyboard shortcuts implementation
+- [x] Separate keyboard shortcuts implementation
-- [ ] Move notification and toast management
+- [x] Move notification and toast management
-- [ ] Create utility functions for DOM manipulation
+- [x] Create utility functions for DOM manipulation
 
 #### 1.2.6: API Communication Module
-- [ ] Extract AJAX/Fetch calls into api.js
+- [x] Extract AJAX/Fetch calls into api.js
-- [ ] Create functions for heartbeat, message sending, and data fetching
+- [x] Create functions for heartbeat, message sending, and data fetching
-- [ ] Implement API error handling and retry logic
+- [x] Implement API error handling and retry logic
-- [ ] Separate WebSocket or polling mechanisms
+- [x] Separate WebSocket or polling mechanisms
 
 ### Sub-task 1.3: HTML Structure Refactoring