chore: migrate to from yarn, lerna and shipjs to bun & changesets

[dylantientcheu]

Migration from Yarn/Lerna/ShipJS to Bun & Changesets

This PR migrates the monorepo from Yarn + Lerna + ShipJS to Bun + Changesets.

Key Changes

• Build system: Migrated from Rollup to tsdown for all packages (base branch)
• Package manager: Replaced Yarn with Bun
• Release workflow: Migrated from ShipJS to Changesets
• E2E testing: Migrated from Cypress to Playwright
• CI/CD: Updated CircleCI config for Bun

Recent Fixes

• Fixed navbar search container selector to work with dynamic CSS class hashes
• Fixed Playwright e2e tests (strict mode violations and navigation timing)
• Fixed Vitest config to exclude e2e tests and node_modules from unit test runs

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[chatgpt-codex-connector]

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