refactor: split mcp-servers-section into modular components

Refactored 1348-line monolithic file into proper folder structure
following folder-pattern.md conventions:

Structure:
- components/ - UI components (card, header, settings, warning)
- dialogs/ - 5 dialog components (add/edit, delete, import, json edit)
- hooks/use-mcp-servers.ts - all state management & handlers
- types.ts, constants.ts, utils.tsx - shared code

Main file reduced from 1348 to 192 lines (composition only).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/components/views/settings-view/mcp-servers/index.ts

@@ -1 +1,2 @@
 export { MCPServersSection } from './mcp-servers-section';
+export { MCPToolsList, type MCPToolDisplay } from './mcp-tools-list';