- Replace solid black 50% opacity with radial gradient
- Center: 80% black (rgba(0,0,0,0.8))
- Corners: 70% black (rgba(0,0,0,0.7))
- Apply to both ModelSelectionModal and McpServerModal
- Creates softer, more visually appealing backdrop
- Remove bg-black bg-opacity-50 classes and use inline style
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