UI: gateway dashboard with glassmorphism theme system
Add a full-featured gateway dashboard UI built on Lit web components.
Shell & plumbing:
- App shell with router, controllers, and dependency wiring
- Login gate, i18n keys, and base layout scaffolding
Styles & theming:
- Base styles, chat styles, and responsive layout CSS
- 6-theme glassmorphism system (Obsidian, Aurora, Solar, etc.)
- Glass card, glass panel, and glass input components
- Favicon logo in expanded sidebar header
Views & features:
- Overview with attention cards, event log, quick actions, and log tail
- Chat view with markdown rendering, tool-call collapse, and delete support
- Command palette with fuzzy search
- Agent overview with config display, slash commands, and sidebar filtering
- Session list navigation and agent selector
Privacy & polish:
- Redact toggle with stream-mode default
- Blur host/IP in Connected Instances with reveal toggle
- Sensitive config value masking with count badge
- Card accent borders, hover lift effects, and responsive grid
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