chore: update leafygreen chat components for MessageLinks

[lerouxb]

~/mongo/compass % npx compass-scripts update-dependencies "@lg-chat/*" @leafygreen-ui/lib@15 @leafygreen-ui/tokens @leafygreen-ui/banner --unsafe-force-install

And then remove one line of new excess padding.

[Copilot]

Pull Request Overview

This PR updates LeafyGreen UI chat components and core dependencies to their latest versions as part of a routine dependency maintenance task. The updates primarily focus on @lg-chat/* packages, core LeafyGreen libraries, and includes a small CSS fix to remove excess padding.

• Update all @lg-chat/* components to latest versions (multiple minor/patch updates)
• Upgrade core LeafyGreen dependencies: @leafygreen-ui/lib, @leafygreen-ui/tokens, and @leafygreen-ui/banner
• Remove excess padding in assistant chat component styling

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/compass-components/package.json	Updates all chat-related dependencies and core LeafyGreen packages
packages/compass-assistant/src/assistant-chat.tsx	Adds explicit padding reset and updates comment for clarity
package.json	Updates root-level LeafyGreen dependencies to match component versions

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