Fix dualscreenactivity darkmode

[mohitc1]

Issue:
Color constant value "white" is defined in both Android Common and Auth App
In Common, this is defined as FFFFFF which is real white.

In Auth App, defined as background_1, which itself it defined as FFFFFF (white) in day mode - light and 000000 in night mode. 000000 is actually black.

Due to same names, the final APK uses the one from auth app, and effectively makes color of DualScreenActivity black (000000) in dark theme/night mode.

Fix
Change the constant name in Android common. Named it with prefix library package suffix com_microsoft_identity_common, to avoid any conflicts.
Going forward we should name resources with namespace prefix to avoid resource merging issues. (Perhaps rename existing ones)

Also change them for DualScreenActivity from Base.Theme.AppCompat.Light to Theme.AppCompat.Light (recommended)

Auth App should also address this: Using "white" to indirectly define both white and black, is misleading and causes confusion.

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[Copilot]

Pull Request Overview

This PR fixes a resource naming conflict in the DualScreenActivity dark mode where a color constant named "white" was defined in both Android Common and Auth App with different values, causing the activity to display incorrectly in dark theme.

• Renamed the color constant from "white" to "com_microsoft_identity_common_white" in Android Common to avoid conflicts
• Updated the DualScreenActivity theme to use the renamed color constant
• Added changelog entry documenting the fix

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
common/src/main/res/values/colors.xml	Renamed color constant to include library namespace prefix
common/src/main/res/values/styles.xml	Updated theme to reference the renamed color constant
changelog.txt	Added entry documenting the bug fix

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