feat(popover): add compound popover atom

[egdev6]

Summary

• Add the compound Popover atom API backed by Radix Popover
• Cover size/variant placement behavior, accessibility naming, dark-scope portal styling, reduced motion, and Storybook examples
• Export Popover from the package root and add @radix-ui/react-popover

Related Issue

Closes #26

Checklist

• I have read the contribution guidelines
• I have updated documentation where needed
• I have added tests for new behavior
• I have run the test suite
• I have verified Storybook builds successfully

[Copilot]

Pull request overview

Adds a new compound Popover atom backed by Radix Popover, with styling, accessibility naming, stories, tests, and package exports.

Changes:

• Introduces Popover compound API with trigger/content/slot hooks and variants.
• Adds Storybook examples and Vitest coverage for behavior, accessibility, placement, dark portal scope, and controlled state.
• Adds @radix-ui/react-popover dependency and exports the atom from the package root.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/components/atoms/popover/Popover.tsx	Defines the compound Popover components and Radix integration.
src/components/atoms/popover/usePopover.ts	Adds Popover state, trigger composition, content props, and slot hooks.
src/components/atoms/popover/types.ts	Defines Popover variants, prop types, and compound API typing.
src/components/atoms/popover/Popover.test.tsx	Adds hook and component behavior tests.
src/components/atoms/popover/Popover.stories.tsx	Adds Storybook documentation and examples.
src/components/atoms/popover/index.ts	Re-exports Popover and types.
src/styles/theme.css	Adds reduced-motion handling for popover content.
src/index.ts	Exports Popover from the package root.
package.json	Adds Radix Popover dependency.
pnpm-lock.yaml	Locks the new dependency and related resolution metadata.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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