[LG-5713] feat(tooltip): add variant prop with compact option

[stephl3]

✍️ Proposed changes

Adds a new variant prop to the Tooltip component with two options: 'default' and 'compact'. The 'compact' variant provides a smaller, more space-efficient tooltip design with reduced padding and border radius. This change also implements a discriminated union type system that prevents the baseFontSize prop from being used when variant is set to 'compact', ensuring type safety and preventing invalid prop combinations.

🎟️ Jira ticket: LG-5713

✅ Checklist

• I have added stories/tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have run pnpm changeset and documented my changes

🧪 How to test changes

1. Default variant (existing behavior):

   • Render a Tooltip without specifying variant or with variant="default"
   • Verify it displays with the standard padding and border radius
   • Verify baseFontSize prop works correctly

2. Compact variant:

   • Render a Tooltip with variant="compact"
   • Verify it displays with reduced padding and smaller border radius
   • Verify the notch is not rendered for compact variant
   • Attempt to use baseFontSize prop with variant="compact" and verify TypeScript prevents this combination

3. Type safety:

   • In a TypeScript file, attempt to pass both variant="compact" and baseFontSize props together
   • Verify TypeScript shows a type error preventing this invalid combination

4. Visual regression:

   • Check Storybook stories for both variants in light and dark modes
   • Verify the compact variant maintains proper contrast and readability

[changeset-bot]

🦋 Changeset detected

Latest commit: 1df05bb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 18 packages

Name	Type
@leafygreen-ui/tooltip	Minor
@leafygreen-ui/code-editor	Patch
@leafygreen-ui/code	Patch
@leafygreen-ui/copyable	Patch
@leafygreen-ui/guide-cue	Patch
@leafygreen-ui/info-sprinkle	Patch
@leafygreen-ui/inline-definition	Patch
@leafygreen-ui/number-input	Patch
@leafygreen-ui/pipeline	Patch
@leafygreen-ui/side-nav	Patch
@leafygreen-ui/stepper	Patch
@leafygreen-ui/toolbar	Patch
@lg-chat/lg-markdown	Patch
@leafygreen-ui/drawer	Patch
@leafygreen-ui/chip	Patch
@lg-chat/message	Patch
@leafygreen-ui/combobox	Patch
@lg-chat/message-feed	Patch

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