fix(popover): fix the undefined classname

[firede]

Checklist

• Fix linting errors
• Label has been added

Change information

Changes

• Popover: add default portalClassName
• Popover.Item: add default className

Snapshots

[codecov]

Codecov Report

Merging #307 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #307   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files         186      186           
  Lines        2373     2373           
  Branches      568      568           
=======================================
  Hits         2372     2372           
  Misses          1        1           

Impacted Files	Coverage Δ
components/popover/popover.tsx	100.00% <ø> (ø)
components/popover/popover-item.tsx	100.00% <100.00%> (ø)

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[unix]

👍 Great work! Thank you for your contribution.