Add connector cards not accessible in dark theme

### Severity

P2 - High (Major functionality broken)

### MCP Server Creation Source

MCP Server in Api Center

### Describe the Bug with repro steps

**Expected behavior:**
Dark background for accessibility.

**Actual behavior:**
White background.

**Steps to reproduce:**
- API center
- Connect LA
- Add tools
- View connectors side panel

### Screenshots or Videos

### Environment

Edge

### Are you experiencing a regression?

_No response_

### Additional context

_No response_