feat(styling): align calendar picker CSS variables for Dark Theme

[ghiscoding]

Summary

Provide calendar picker (vanilla-calenar-pro) CSS variables for Dark Theme

Why

to better aligned with the rest of Dark Mode theme

Changes

variables and styling files

Validation

simply tested in UI

Comments

AI / LLM assistance

• AI / LLM assistance used:
  • No
  • Yes
• If Yes:
  • which tool/model:
  • how was it used:

Checklist

• The changes are limited to only one scope (if not please explain why in the comments above).
• Tests were added or updated where appropriate.
• Documentation was updated where appropriate.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (10df611) to head (8f79e35).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2793   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         199      199           
  Lines       25867    25867           
  Branches     9176     9176           
=======================================
  Hits        25867    25867           

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <ø> (ø)

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commit: 8f79e35