fix(desktop): use modern Node for Vite builds

[evilguy4000]

Run desktop packaging workflows on Node 24 and load Vite through an ESM config so macOS, Linux, and Windows builds use a runtime compatible with Vite 7.

Description

Brief description of the change and why it's needed.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would change existing behavior)
• Documentation update
• Refactor (no functional change)

Checklist

• My code follows the project's style guidelines (Black, flake8).
• I have added/updated tests for my changes.
• All tests pass locally (e.g. pytest).
• I have updated the documentation if needed.
• For user-facing changes, I have added an entry to the Unreleased section of CHANGELOG.md.

Related issues

Fixes # (issue number, if applicable)

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See CONTRIBUTING.md and CHANGELOG.md for guidelines.

[github-actions]

❌ CI Test Results

Overall Status: 2 test suite(s) failed

Test Results: 0/7 passed

Test Suites:

• ❌ Smoke Tests: failure
• ⏭️ Unit Tests: skipped
• ⏭️ Integration Tests: skipped
• ⏭️ Security Tests: skipped
• ❌ Code Quality: failure
• ⏭️ Docker Build: skipped
• ⏭️ Full Test Suite: skipped

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Commit: 576c002
Workflow: 24934784732