chore(spa): Upgrade TypeScript to 6.0.2 and fix dependency compatibility (#650)

chore(spa): Upgrade TypeScript to 6.0.2 and fix dependency compatibility (#650)

* chore(spa): upgrade TypeScript to 6.0.2 and fix dependency compatibility

- Bump typescript from ~5.9.3 to ~6.0.2 (resolves Dependabot PR #647)
- Add npm overrides for @typescript-eslint/* peer dep on typescript
  (typescript-eslint 8.x declares peer dep <6.0.0 but works with TS6)
- Remove deprecated baseUrl from tsconfig.json (deprecated in TS 6.0)
- Fix brace-expansion vulnerability (2.0.2 → 2.0.3 via lockfile update)

Agent-Logs-Url: https://github.com/metanull/inventory-app/sessions/82c14e4b-4ccc-4c30-882b-2a5034a40c3a

Co-authored-by: metanull <20630081+metanull@users.noreply.github.com>

* fix: bump root brace-expansion 5.0.4 → 5.0.5 to resolve npm audit vulnerability (GHSA-f886-m6hf-6m8v)

Agent-Logs-Url: https://github.com/metanull/inventory-app/sessions/99d5f4d7-3925-4573-a5f2-3e36cdd08f56

Co-authored-by: metanull <20630081+metanull@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: metanull <20630081+metanull@users.noreply.github.com>