fix: edge-to-edge on auth activity

[MykhailoNester]

• disable edge-to-edge for auth activity to avoid conflicts with ;

This is an SDK activity. We don't control the client's theme, can't predict their windowBackground, and shouldn't leave modified WindowInsetsController state.
android:windowOptOutEdgeToEdgeEnforcement is scoped entirely to this activity's window — the client's other activities are completely unaffected.

---

Note

Low Risk
Low risk style-only change scoped to AuthTheme used by AuthActivity; main risk is minor visual/layout differences on API 35 devices.

Overview
Auth screen edge-to-edge behavior is adjusted on Android 15+. AuthTheme now opts out of edge-to-edge enforcement by setting android:windowOptOutEdgeToEdgeEnforcement (gated with tools:targetApi="35"), preventing system edge-to-edge conflicts for the SDK AuthActivity without affecting host app activities.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (09d8858) to head (de030eb).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##             master   #338       +/-   ##
===========================================
- Coverage     58.10%      0   -58.09%     
===========================================
  Files            57      0       -57     
  Lines          1785      0     -1785     
  Branches        321      0      -321     
===========================================
- Hits           1037      0     -1037     
+ Misses          524      0      -524     
+ Partials        224      0      -224     

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