fix(deps): resolve Dependabot security alerts

[vivekanand1101]

Description

Resolve all open Dependabot alerts by updating vulnerable development dependencies and Yarn resolutions, including:

• Vite, Vitest, esbuild, and PostCSS
• Babel, brace-expansion, fast-uri, immutable, and js-yaml
• additional vulnerable transitive tooling dependencies reported by yarn audit

The regenerated yarn.lock resolves the patched dependency graph, and yarn audit now reports zero vulnerabilities.

Validation

• yarn install --frozen-lockfile
• yarn audit — 0 vulnerabilities
• yarn lint
• yarn build
• yarn build-storybook
• yarn test --run — no test files exist in the repository, so Vitest exits with code 1