chore(dashboard): bump deps to latest stable

[pratyush618]

Summary

Brings the dashboard build/runtime stack to current latest-stable. Each major bump is its own commit so any single one can be reverted independently.

Bump	Reason
Within-major refresh	Pull @tanstack/*, lucide-react, biome, tailwindcss, etc. forward inside their existing ranges
@types/react-dom 18 → 19	Aligns with react-dom@^19.2.5 already in use (was a known mismatch)
sonner 1 → 2	Latest major; type-check + tests pass clean
@types/node 22 → 25	Type-only; build/test/typecheck unaffected
vite 6 → 7	One-major hop, @vitejs/plugin-react@5.2.0 peer-supports both
vite 7 → 8 + @vitejs/plugin-react 5 → 6	Must move together — plugin-react 6 requires Vite ^8
typescript 5 → 6	Removes deprecated baseUrl: "." from tsconfig.json (TS 6 deprecates, removes in TS 7) — paths resolves from tsconfig location automatically

Verification (local)

• pnpm run ci — biome (153 files clean), tsr generate && tsc --noEmit (no errors), vitest (34/34), vite build (success, 382ms)
• Vite 8 produces better chunk splits than Vite 6 (largest chunk now 367 KB gzipped 106 KB, down from 688 KB / 205 KB on Vite 6)
• Build is ~10× faster (382ms vs 4.0s)

Test plan

• CI dashboard workflow passes (biome ci + tsc + vitest + vite build)
• Visual smoke: open dashboard locally, click through inspect/locks/queues/workflows