Remove Storyblok integration and changelog dialog

[Copilot]

Removes Storyblok dependency used for in-plugin changelog notifications. The changelog dialog feature can be reimplemented with a different approach in the future.

Changes

Removed components:

• Changelog.tsx modal component and associated rendering in AppContainer
• storyblok.ts utility and tests for fetching changelog from Storyblok API
• StoryblokStory and ChangelogItem type definitions
• changelogSelector Redux selector

State management:

• Removed changelog array from UIState interface
• Removed setChangelog reducer and setLastOpened effect that fetched changelog data
• Fixed unused dispatch parameter in effects object

Dependencies & configuration:

• Removed storyblok-js-client npm package
• Removed STORYBLOK_ACCESS_TOKEN from environment files and documentation
• Removed Storyblok API intercept from Cypress mocks

Preserved:

• External changelog link in Footer (https://tokens.studio/changelog)
• lastOpened timestamp tracking (no functional dependency on changelog feature)

View original Slack conversation

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[changeset-bot]

🦋 Changeset detected

Latest commit: 0584d11

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

This PR includes changesets to release 1 package

Name	Type
@tokens-studio/figma-plugin	Patch

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