Add server testing functionality to MCP config modal

[liangzhang-keepmoving]

Description

This PR adds server testing functionality to the MCP config modal, allowing users to test their configured servers before using them.

Features Added

• Test Button: Added a "Test" button for each configured server
• Real-time Testing: Shows loading state during testing
• Test Results: Displays detailed test results with timestamp
• Server-Specific Testing:
  • SSE Servers: Performs actual connection test
  • Stdio Servers: Validates configuration format

Changes Made

• Added test state management to the MCP config modal
• Implemented testServer function with different testing logic for each server type
• Added test result display with success/failure status
• Updated server list UI to include test button and results

Testing

The testing functionality has been tested with:

• Valid SSE servers (returns success)
• Invalid SSE servers (returns connection error)
• Valid stdio server configurations
• Invalid stdio server configurations

All test cases work as expected, providing clear feedback to the user.

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