refactor(logging): use Timber instead of Kermit

Android-only project, so Timber (the de-facto Android logging lib) fits better than the
KMP-oriented Kermit.

- Catalog: kermit -> timber (com.jakewharton.timber:timber 5.0.1).
- core:data: Ktor Logging bridged to Timber; safeCall logs via Timber.
- app: plant Timber.DebugTree() in debug only (buildConfig enabled for BuildConfig.DEBUG).

gradle/libs.versions.toml

@@ -29,7 +29,7 @@ ktor = "3.1.3"
 coil = "3.1.0"
 
 # Logging
-kermit = "2.0.5"
+timber = "5.0.1"
 
 # Material Components (Views renderer)
 material = "1.12.0"
@@ -110,7 +110,7 @@ coil-compose = { module = "io.coil-kt.coil3:coil-compose", version.ref = "coil"
 coil-network-okhttp = { module = "io.coil-kt.coil3:coil-network-okhttp", version.ref = "coil" }
 
 # --- Logging ---
-kermit = { module = "co.touchlab:kermit", version.ref = "kermit" }
+timber = { module = "com.jakewharton.timber:timber", version.ref = "timber" }
 
 # --- Testing ---
 junit4 = { module = "junit:junit", version.ref = "junit4" }