fix(webapp): open Full setup guide in a new tab

[rubychilds]

Summary

• The "Full setup guide" link on integration pages now opens in a new tab instead of navigating away from the current page
• Previously it opened in the same tab, which was annoying because you'd lose your place on the integration setup page and have to navigate back

Test plan

• Navigate to any integration page (e.g. create a new integration)
• Click "Full setup guide" and verify it opens in a new tab
• Verify the button styling is unchanged

🤖 Generated with Claude Code

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This PR is implemented as a small, scoped UI change in the integration creation page that replaces router-based link behavior with a standard external link pattern so documentation opens in a separate tab without disrupting the current setup flow, while preserving the existing button presentation and applying safe external-link attributes.

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This summary was automatically generated by @propel-code-bot

[propel-code-bot]

No issues found; changes cleanly update the link behavior and styling.

Status: No Issues Found | Risk: Low

Review Details

📁 1 files reviewed | 💬 0 comments

Instruction Files

└── .claude/
    ├── agents/
    │   └── nango-docs-migrator.md
    └── skills