feat: add user notification system for manifest version mismatch

[PaulHax]

Summary

• Add user-facing notification system to replace console warnings when URL parameters are from different manifest versions
• Fix critical KDMA parsing bug for personal_safety and other underscore-containing KDMA names
• Replace http.server with waitress to eliminate BrokenPipeError issues
• Reduce verbose console output during build and server startup

Key Changes

User Notification System

• Implement toast-style notifications that slide down from top of page and auto-dismiss after 4 seconds
• Replace console warning with user-friendly message: "URL parameters are from an older version and have been reset"
• Created notifications.js: Standalone notification system with queue management and animations
• Updated state.js: Import notification module and replace console.warn with user notification
• Enhanced style.css: Added notification styling with slide animations and color schemes

KDMA Parsing Fix

• Fixed critical bug where personal_safety-0.0 was incorrectly parsed as personal and safety KDMAs
• Updated parse_alignment_target_id() to handle single-value KDMAs with underscores properly
• Added comprehensive test coverage for KDMA parsing edge cases
• Now correctly handles both personal_safety-0.0 and ADEPT-June2025-personal_safety-0.0 formats

Infrastructure Improvements

• Replace http.server with waitress for better stability and error handling
• Reduce verbose console output during build process for cleaner logs
• Add proper WSGI application for static file serving

Test plan

• Load page with URL parameters from different manifest version
• Verify notification appears at top of page with warning styling
• Confirm notification auto-dismisses after 4 seconds
• Test personal_safety KDMA experiments load correctly
• Verify server starts without BrokenPipeError issues
• Ensure no console errors in browser

Closes #29