privacy mask toggle

[Jumongweb]

Closes #710

Summary

• Add a privacy mask toggle to the home dashboard balance card so sensitive balance digits are hidden by default.
• Tapping the eye icon toggles mask state; when enabled, Available Balance and Earning Balance display •••••• instead of real amounts.
• Eye icon switches between eye-outline (masked) and eye-off-outline (visible) with accessibility labels for show/hide.

Test plan

• Open the personal home screen and confirm balances show •••••• by default.
• Tap the eye icon and confirm real Available Balance and Earning Balance values appear.
• Tap again and confirm amounts are masked again.
• Pull to refresh and confirm the mask state persists while toggled.
• Verify the eye toggle has correct accessibility labels ("Show balance" / "Hide balance").

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[ONEONUORA]

@Jumongweb
PLs make your implementation to pass CI checks

[ONEONUORA]

Great job @Jumongweb