feat(card): uses n as CSS vars prefix

[Sepush]

Signed-off-by: Sepush sepush@outlook.com

close #1921

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/tusimple/naive-ui/Hn4yZMYQ2ZmDDbingxUKMfpTyM92
✅ Preview: https://naive-ui-git-fork-sepush-card-tusimple.vercel.app

[codecov]

Codecov Report

Merging #1922 (1f99a95) into main (b7721f8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1922   +/-   ##
=======================================
  Coverage   64.62%   64.63%           
=======================================
  Files         890      890           
  Lines       17404    17404           
  Branches     4127     4127           
=======================================
+ Hits        11248    11249    +1     
  Misses       5377     5377           
+ Partials      779      778    -1     

Impacted Files	Coverage Δ
src/card/src/styles/index.cssr.ts	100.00% <ø> (ø)
src/card/src/Card.tsx	84.61% <100.00%> (+2.56%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b7721f8...1f99a95. Read the comment docs.