Post 0.4.0 Polish

Added

• Added an undeployed-changes indicator across SNMP-related pages to make pending SNMP changes more visible.
• Added goto input and goto output navigation buttons in the graph editor.
• Added a global scroll-to-top control that appears after scrolling far enough down a page.
• Added support for closing modals globally by pressing Esc.
• Added a CONTRIBUTING.md guide for project contributors.

Changed

• Replaced browser-native confirmation and dialog boxes with the application's native popup experience.
• Centralized toast handling in base.js and removed older SNMP-specific showToast usage.
• Improved documentation structure and organization to make it easier to navigate.
• Updated automation for generating NOTICE content and license headers.
• Removed concurrent rotating file handlers to avoid ongoing complexity from an inconvenient transitive dependency.

Fixed

• Fixed Docker packaging so the /docs/ directory is copied into the image and the in-app documentation feature works as expected.