android: cap island width on tablets

[ousamabenyounes]

Summary

• Cap the Dynamic Island overlay width on tablet-sized displays.
• Keep phone behavior proportional while avoiding oversized tablet overlays.
• Add a unit test for phone and tablet width calculations.

Issues

Fix #657

Test verification (RED -> GREEN)

RED before implementation:

e: IslandWindowTest.kt:27:47 Unresolved reference 'calculateIslandWindowWidth'.
e: IslandWindowTest.kt:32:48 Unresolved reference 'calculateIslandWindowWidth'.

GREEN with fix:

> Task :app:testFossDebugUnitTest
BUILD SUCCESSFUL

Revert proof:

IslandWindowTest > tabletWidthIsCapped FAILED
java.lang.AssertionError at IslandWindowTest.kt:32
2 tests completed, 1 failed

Final checks:

./gradlew testFossDebugUnitTest --tests me.kavishdevar.librepods.presentation.overlays.IslandWindowTest
BUILD SUCCESSFUL

./gradlew assembleFossDebug
BUILD SUCCESSFUL

[hanslauch325-eng]

Thank you very much could you please release or send me a version so I can test it?