fix: dark mode email account css (backport #753)

[mergify]

Fixes dark mode css for email account settings

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This is an automatic backport of pull request #753 done by Mergify.

[mergify]

Cherry-pick of 9c45877 has failed:

On branch mergify/bp/main-hotfix/pr-753
Your branch is up to date with 'origin/main-hotfix'.

You are currently cherry-picking commit 9c45877.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   frontend/src/components/Settings/EmailAccountCard.vue
	deleted by us:   frontend/src/components/Settings/EmailAccountList.vue
	deleted by us:   frontend/src/components/Settings/EmailAdd.vue
	deleted by us:   frontend/src/components/Settings/EmailEdit.vue
	deleted by us:   frontend/src/components/Settings/EmailProviderIcon.vue

no changes added to commit (use "git add" and/or "git commit -a")

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