Full application redesign using Terminal Design System v1.2 (lt-* class
system). Introduces shared layout_header/footer partials, upgrades
base.css/base.js to TDS v1.2, and rewrites all views (Dashboard, Ticket,
CreateTicket, and all 7 admin views) with lt-frame, lt-table, lt-modal,
lt-stats-grid, lt-kv-grid, and data-action event delegation patterns.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
