- FIX: Tunnel close forwarding between wssshc, server, and wsssht
  * Server now properly forwards tunnel_close messages to wsssht
  * Prevents wsssht processes from hanging after client-initiated closure
  * Ensures proper cleanup of tunnel resources on all endpoints

- FIX: Web terminal JavaScript issues
  * Fixed FitAddon loading issues by switching to unpkg CDN
  * Resolved JavaScript variable scoping error (fitAddon undefined)
  * Added proper error handling for xterm.js library loading failures
  * Enhanced debug logging for library loading and terminal initialization

- FEATURE: Fullscreen terminal support
  * Added fullscreen toggle button (⛶/⛝) to terminal interface
  * Cross-browser fullscreen API support (Chrome, Firefox, Safari, IE11)
  * Automatic terminal resizing when entering/exiting fullscreen mode
  * Backend synchronization of terminal dimensions during fullscreen changes

- FIX: Logo serving path
  * Updated Flask routes to serve logo files from logos/ directory
  * Added proper PyInstaller support for bundled logo assets
  * Fixed favicon.ico and image.jpg serving for both development and frozen executables

- DOCS: Updated changelog, README, and documentation
  * Added version 1.6.2 changelog with comprehensive change details
  * Updated README with fullscreen feature mention
  * Enhanced documentation with recent updates section

Technical Details:
- Server-side tunnel close message routing in websocket.py
- JavaScript library management with robust error recovery
- Cross-browser fullscreen API implementation
- Asset management for both development and production environments