Make getting started guide rows clickable

[snehkagrana]

Description

Fixes the Getting Started guide disclosure rows so clicking the row text/label toggles each section, instead of only the chevron/down-arrow area responding.

This updates the three guide rows in WelcomeView to use a reusable button-backed disclosure row. The visual treatment remains the same: chevron, labels, feature badges, section content, reduce-motion animation handling, and accessibility expanded/collapsed values are preserved.

Type of Change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 🧹 Chore
• 📝 Documentation update

Related Issues

• Not linked

Testing

• Tested on Intel Mac
• Tested on Apple Silicon Mac
• Tested on macOS 26.5.1
• Ran linter locally: swiftlint --strict --config .swiftlint.yml Sources
• Ran formatter locally: swiftformat --config .swiftformat Sources

Additional verification:

• xcodebuild test -project Fluid.xcodeproj -scheme Fluid -destination 'platform=macOS' CODE_SIGNING_REQUIRED=NO CODE_SIGNING_ALLOWED=NO — 48 tests passed, 0 failures
• git diff --check

Notes

• swiftlint and swiftformat are not installed in this local environment, so those checks were not run.
• This repository does not currently include a UI test target or SwiftUI view-inspection dependency for automating a row-click regression. The change keeps the interaction localized by making each guide header a full-width SwiftUI Button.

Screenshots / Video

Not included. This is a small interaction-target fix with no intended visual change.