fix: use scribeAppBackground in SettingsTab for consistent background color

[prince-0408]

Summary

Fixes #647

Problem

The Settings tab was using Color.scribeBlue as its background color, while the Conjugate and About tabs both use Color("scribeAppBackground"). This caused a visible color mismatch when switching between tabs.

Change

In SettingsTab.swift, replaced:

Color.scribeBlue
    .ignoresSafeArea()

with:

Color("scribeAppBackground")
    .ignoresSafeArea()

Result

All three tabs now share the same background color, giving a consistent look across the app.

Screenshots

Before	After

[github-actions]

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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• Tests for changes have been written and the CI unit test, linting and formatting workflows within the PR checks do not indicate new errors in the files changed

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[andrewtavis]

Thanks for the quick fix, @prince-0408! 😊