fix(app): enable router preemptive mode

[pi0]

• add failing test
• fix(app): enable router preemptive mode

🔗 Linked issue

Resolves #1503, nuxt/nuxt#22382

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #1504 (2d000dd) into main (c4c217a) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1504      +/-   ##
==========================================
- Coverage   76.25%   76.19%   -0.06%     
==========================================
  Files          73       73              
  Lines        7453     7453              
  Branches      733      732       -1     
==========================================
- Hits         5683     5679       -4     
- Misses       1769     1772       +3     
- Partials        1        2       +1     

see 1 file with indirect coverage changes