fix(android): log Rust panics to logcat via android_log

[0xbrayo]

First follow-up from ActivityWatch/aw-android#220.

Rust's default panic hook writes to stderr, which Android discards, so a panic in libaw_sync.so currently surfaces only as SIGABRT with no message in logcat.

This installs:

• aw-sync: android_logger plus a panic hook that writes the payload, location, and backtrace via __android_log_write (tag aw-sync), installed from JNI_OnLoad and each JNI entry
• aw-server: log_panics::init() during Android initialize() so panics in libaw_server.so are diagnosable the same way (tag aw-server-rust)

This does not fix the abort itself; it makes the panic diagnosable.

Verified: cargo test -p aw-sync (5/5) and ./compile-android.sh arm64 (JNI_OnLoad exported from libaw_sync.so).

[greptile-apps]

Greptile Summary

This PR makes Android-native Rust panics visible in logcat without changing panic termination behavior.

• Adds Android logging and a panic hook to aw-sync, initialized during library loading and at every JNI entry point.
• Initializes log_panics after the Android logger in aw-server.
• Adds the target-specific android_logger dependency and corresponding lockfile edge.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code failure identified.

The logging setup is target-scoped and idempotent, JNI calls retain a fallback initialization path, and the dependency update does not introduce a newly resolved vulnerable package.

Important Files Changed

Filename	Overview
aw-sync/src/android.rs	Adds idempotent Android logger setup, direct fatal logcat output, panic diagnostics, JNI_OnLoad, and defensive initialization at each JNI boundary.
aw-server/src/android/mod.rs	Installs log_panics after Android logger initialization so server panics are routed to logcat.
aw-sync/Cargo.toml	Adds android_logger only for Android targets.
Cargo.lock	Records android_logger as an aw-sync dependency without changing resolved package versions.

Sequence Diagram

sequenceDiagram
    participant App as Android app
    participant VM as JVM loader
    participant Sync as libaw_sync.so
    participant Server as libaw_server.so
    participant Logcat
    App->>VM: Load aw_sync
    VM->>Sync: JNI_OnLoad
    Sync->>Sync: Initialize android_logger and panic hook
    App->>Server: initialize()
    Server->>Server: Initialize logger and log_panics
    App->>Sync: Invoke sync JNI operation
    Sync->>Sync: Ensure logging initialized once
    alt Rust panic
        Sync->>Logcat: Payload, location, and backtrace
    end

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_{Reviews (1): Last reviewed commit: "fix(android): log Rust panics to logcat ..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.11%. Comparing base (656f3c9) to head (34814ce).
⚠️ Report is 88 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #654      +/-   ##
==========================================
+ Coverage   70.81%   77.11%   +6.29%     
==========================================
  Files          51       65      +14     
  Lines        2916     5370    +2454     
==========================================
+ Hits         2065     4141    +2076     
- Misses        851     1229     +378     

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