Fix Kotlin compiler warnings in Destinations.kt and MainActivity.kt

[ssawchenko]

Written by Claude Code

Surfaced during the Gradle 9 migration (ss/130_gradle_9_migration). These are pre-existing Kotlin compiler warnings that should be addressed in a follow-up.

steamclog/src/main/java/com/steamclock/steamclog/Destinations.kt

• Lines 34, 123, 159 — Overrides a deprecated DebugTree/Tree member (from Timber) without being marked @Deprecated itself. Should either propagate the @Deprecated annotation or suppress with justification.
• Lines 41, 127, 166 — Parameter name mismatch with supertype: the overriding parameter is not named t as it is in DebugTree/Tree. This can cause unexpected behaviour when callers use named arguments.
• Line 259 — Unnecessary safe call (?.) on a non-null File receiver.

app/src/main/java/com/steamclock/steamclogsample/MainActivity.kt (sample app)

• Line 223 — Use of a delicate API without acknowledging the risk (missing @OptIn or equivalent).
• Line 76 — Redundant else branch in an exhaustive when expression.