chore: update npm dependencies and regenerate lockfile

[kern]

Motivation

• Bring runtime and development dependencies up to current, addressing outdated packages and transitive vulnerabilities.
• Align tooling (build/test/lint) with recent versions to match modern Node and ecosystem expectations.

Description

• Bumped a large set of runtime dependencies in package.json (notable bumps: next 15→16, @tanstack/react-query, ioredis, express, zod, tailwindcss, web-streams-polyfill, etc.) and updated many devDependencies (vitest 3→4, typescript 5.8→5.9, @vitejs/plugin-react, eslint, prettier, playwright, and others).
• Regenerated pnpm-lock.yaml to capture the updated dependency graph and transitive upgrades.
• Updated numerous transitive packages (Babel, Rollup, esbuild, lightningcss, jsdom, etc.) as part of the lockfile refresh.
• Only package.json and pnpm-lock.yaml were modified to apply the upgrades.

Testing

• Ran pnpm up -L to update packages and refresh the lockfile, which completed successfully.
• Ran pnpm test (Vitest) and the full test suite passed (vitest run completed with all tests passing).

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Codex Task