fix: UI changes

[AnishSarkar22]

Description

• Add link to external connectors with icon.
• Replace server icon with info icon in alert and update alert styling.

Motivation and Context

FIX #

Screenshots

API Changes

• This PR includes API changes

Change Type

• Bug fix
• New feature
• Performance improvement
• Refactoring
• Documentation
• Dependency/Build system
• Breaking change
• Other (specify):

Testing Performed

• Tested locally
• Manual/QA verification

Checklist

• Follows project coding standards and conventions
• Documentation updated as needed
• Dependencies updated as needed
• No lint/build errors or new warnings
• All relevant tests are passing

High-level PR Summary

This PR makes minor UI refinements to connector-related components, including updating icon imports and simplifying the styling of an alert component in the MCP connection form, as well as adding a new "Add external connectors" link to the playground sidebar with appropriate icons and hover effects.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/components/assistant-ui/connector-popup/connect-forms/components/mcp-connect-form.tsx
2	surfsense_web/components/layout/ui/playground/PlaygroundSidebar.tsx

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