EAG-14: fix CLAUDE.md — stale version, missing Playwright E2E docs, pnpm/yarn split, Storybook

[MrCoder]

Summary

• Updates @zenuml/core version from stale v3.32.3 to actual ^3.49.2
• Clarifies package manager split: Yarn for most tasks, pnpm for Playwright E2E (playwright.config.js uses pnpm dev)
• Adds full Playwright E2E testing documentation including remote/prod-build modes
• Adds /e2e/tests/ to the key directories list
• Adds Storybook to Important Development Notes
• Explains Vue/Vuex as peer dependencies of the Vue-based @zenuml/core engine

Closes EAG-14

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