Merge: a log that survives the process, so the tablet can be debugged

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

# Conflicts:
#	apps/darkroom-android/Cargo.toml
#	apps/darkroom-desktop/Cargo.toml
#	platform/dr-plat/src/lib.rs

Cargo.lock

@@ -1224,6 +1224,7 @@ name = "darkroom-android"
 version = "0.9.0"
 dependencies = [
  "android_logger",
+ "dr-plat",
  "dr-sync",
  "dr-ui",
  "jni 0.21.1",
@@ -1236,6 +1237,7 @@ name = "darkroom-desktop"
 version = "0.9.0"
 dependencies = [
  "anyhow",
+ "dr-plat",
  "dr-ui",
  "env_logger",
  "log",