feat: save app and ldk logs to same file

[ovitrif]

Closes #655

Summary

Both APP and LDK logs now write to the same file in chronological order.

Changes

• Created shared LogSaver instance used by both APP and LDK loggers
• Unified log file path: bitkit_<timestamp>.log
• Logs automatically in chronological order due to shared file
• File writes serialized via single-threaded coroutine queue
• APP/LDK tag prefixes distinguish log sources

Preview

Testing

1. Uninstal previous app, build & open app, reset & restore wallet
2. Export logs via Settings > Advanced > Lightning Connections > "Export…" button
3. Extract & open the most recent logs files in a text editor
4. ✔️ Verify both app and ldk-node logs were recorded in chrono order

Or, as a dev just go to device explorer and the app's data folder and open that file in Android Studio to check.

[jvsena42]

Tested

• Reset and setup flow
• Single log file creation

nit: could add a method in the future for wipe old log files

[jvsena42]

@ovitrif there are unverified commits

[ovitrif]

@ovitrif there are unverified commits

@jvsena42 should be ok now, pls review/approve.

fix: Squashed all commits

[ovitrif]

Also added a change to claude workflow which is supposedly going to fix the signed commits issues

[jvsena42]

• Reset app
• logs displayed on correct order

2026-01-26 11:21:18.911  8132-8257  APP                     to.bitkit.dev                        W  2026-01-26 14:21:18.911 WARN    [Logger.kt:60]                       Wiping entire logs directory… - Logger
2026-01-26 11:21:18.919  8132-8257  APP                     to.bitkit.dev                        I  2026-01-26 14:21:18.919 INFO    [Logger.kt:242]                      Log session initialized with file path: '/data/user/0/to.bitkit.dev/files/logs/bitkit_2026-01-26_14-21-18.log' - LogSaver
2026-01-26 11:21:18.920  8132-8257  APP                     to.bitkit.dev                        I  2026-01-26 14:21:18.920 VERBOSE [Logger.kt:249]                      Deleting old log files… - LogSaver