- Created standalone DiagnosticsPanel component with modern visual design
- Gradient header with system health indicator
- Card-based layout for System Runtime, PVE Nodes, PBS, Discovery
- Status badges and improved visual hierarchy
- Export functionality (full and GitHub-sanitized)
- Reduced Settings.tsx from 8,035 to 5,956 lines (26% reduction)
- Removed ~2,079 lines of inline diagnostics code
- Improved maintainability by encapsulating diagnostics logic
- Improved AI Settings UX:
- Cost Controls: Gradient design, RECOMMENDED badge, $ prefix
- Shows daily/weekly budget equivalents when value is entered
- Auto-Fix: Streamlined acknowledgment with clear button instead of checkbox
- Better visual hierarchy throughout
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