v0.4.2-alpha - Fix Invitation Key toggle and Timezone Settings persistence

What's Changed

Bug Fixes

• Fixed Invitation Key toggle requiring multiple page refreshes to reflect state changes by implementing comprehensive cache-busting strategies
• Fixed Timezone Settings not persisting selected timezone and resetting to default values
• Fixed page-loader script overwriting server-side data attributes with cached values

Technical Details

• Added HTTP cache control headers to login.php to prevent HTML page caching
• Added data attributes directly to body tag for immediate availability of configuration values
• Removed data attribute setting from page-loader.php to prevent overwriting server-side values
• Changed cache-busting parameter for page-loader to use timestamp for fresh load on every request
• Added PHP opcode cache invalidation in settings.php when config file is updated
• Prioritized session timezone over database timezone values
• Removed problematic session update logic that was overwriting session timezone with database value
• Added error logging for database update failures in timezone settings

Note: This is an alpha release for testing purposes.