Three more files had their own INTEGRATION_ICONS record that required
the deepagents entry: integration-button-group.tsx, integration-link.tsx,
and integrations.tsx. Fixes TypeScript build error.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The Link element inside sidebar page items only spanned the width of its
text content, so clicking to the right of the text on a sidebar item did
nothing. Move padding and flex layout into the Link so it fills the
entire li container, matching how integration-link.tsx already works.