feat(deps): upgrade Vite to v7 and TanStack packages

[fx]

Summary

• Upgrades Vite from 6.3.5 to 7.2.6
• Upgrades TanStack Router from 1.122.0 to 1.139.14
• Upgrades TanStack React Store from 0.7.1 to 0.8.0

Breaking Changes Addressed

• Vite 7: Requires Node.js 20.19+ (we're on 20.19.6 ✅)
• Vite 7: Default browser targets updated (Chrome 107+, Firefox 104+, Safari 16.0+)

Notes

• Some TanStack packages show Node.js 22.12+ in their engine requirements, but they work correctly on Node.js 20.19.6
• All tests pass (465 tests)
• Linting passes with only pre-existing warnings

Related

Supersedes Dependabot PR #148 (which couldn't be reopened)

Test plan

• All tests pass (npm test)
• Linting passes (npm run lint)
• TypeScript checks pass (npm run typecheck)

[Copilot]

Pull request overview

This PR upgrades Vite from 6.3.5 to 7.2.6 and updates several TanStack packages (React Router from 1.122.0 to 1.139.14, and React Store from 0.7.1 to 0.8.0). The upgrade aims to keep dependencies current and take advantage of Vite 7's improvements. The PR author notes that all tests pass and confirms Node.js 20.19.6 compatibility, though this creates a version mismatch with some package engine requirements.

Key changes:

• Vite major version upgrade (6 → 7) with updated browser targets and Node.js requirements
• TanStack Router packages updated to v1.139.14 with improved features and bug fixes
• TanStack React Store updated to v0.8.0

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.