[WIP] fix: address failing test from portal context PR

[Copilot]

• Added PortalContext to Portal.tsx, allowing consumers to specify a portalContainerName via React context
• Added new tests in Portal.test.tsx to verify correct portal rendering behavior when using PortalContext
• Added a Storybook example (WithPortalContext) in Portal.features.stories.tsx to demonstrate PortalContext usage
• Updated exports in index.ts and the package entry point to include PortalContext
• Fixed failing exports snapshot test to include the new PortalContext export

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