feat(theme): add switchable modern brand skins

[zwulf1k]

What changed

• adds three switchable brand skins: Ipoteka Bank, Aurora, and Graphite
• keeps brand skin independent from light/dark/system mode
• persists both choices across process relaunch
• adds modern semantic palettes, shapes, elevations, dashboard treatment, and vertical preview cards
• uses official Ipoteka Bank green/white logo assets and brand colors
• adds Russian and Uzbek labels
• exposes stable accessibility/resource identifiers for mobile regression tests
• fixes radio controls so accessibility and Appium receive the authoritative selected state

Why

The application previously exposed only a color-mode toggle and could not represent a bank-specific visual identity. The new model separates brand identity from color mode and applies the selected semantic theme at the root, so screens share one consistent palette.

Validation

• :core:designsystem:testDemoDebugUnitTest — passed
• :cmp-android:assembleDemoDebug on Java 21 — passed
• Android emulator regression — passed
• QATools 24-step live scenario — passed, including selection, checked state, relaunch persistence, and themed embedded surface

QATools scenario: mifos-brand-skins-android.scenario.yaml in Arci.QATools#92.

Closes #3150

[mifos-cla-check]

👋 Hi @zwulf1k — thank you for your pull request.

This PR is currently blocked because we do not have a Contributor License Agreement (CLA) on file for your GitHub account.

To get unblocked:

1. Complete the form at https://mifos.org/about-us/financial-legal/mifos-contributor-agreement
2. Complete the CLA signing process
3. Once verified you will be added to the approved contributors list and this PR check will be cleared

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