Added theme page and dark theme

[Megha-Dev-19]

Resolves #124 #197

• Dark theme preview
  https://github.com/user-attachments/assets/76441ab7-516b-41b1-96c9-dd18770aaece

• Theme tests
  video.webm
  video.webm
  video.webm

• Added permission check to all settings config pages, along with tests.

[Megha-Dev-19]

@race-of-sloths include

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Reviewer	Score
@petersalomonsen	13

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@race-of-sloths score 13