Fix ExoPlayer wrong-thread crash + recordSearch off Main (perf-audit pass-2) — vc=79

- PlaybackService: the pauseOnHeadphoneDisconnect settings-watcher collector
  ran on globalScope (Dispatchers.IO) and called setHandleAudioBecomingNoisy
  on the ExoPlayer, which is thread-affine to the Main thread it was built on
  → latent IllegalStateException('Player accessed on the wrong thread') that
  fires every service start (the StateFlow emits on first subscription). Run
  the collector on Dispatchers.Main (mirrors resumePollJob).
- SearchViewModel: recordSearch (json-encode + SharedPrefs write) was on Main;
  wrap in withContext(Dispatchers.IO).

Both adversarially verified in the multi-agent perf audit (pass 2).

buildSrc/src/main/kotlin/ProjectConfig.kt

@@ -9,6 +9,14 @@ const val STRAW_SDK_TARGET = 35
 
 // Sulkta fork — Straw
 //
+// vc=79 / 0.1.0-CM — perf-audit pass-2 (app-side slam-dunks):
+//   * FIX a wrong-thread crash: the headphone-disconnect settings watcher
+//     ran on the IO scope and touched the ExoPlayer (thread-affine to the
+//     Main thread it was built on) → "Player accessed on the wrong thread"
+//     latent on every session. Collector now runs on Dispatchers.Main.
+//   * recordSearch (json-encode + SharedPrefs write) moved off the Main
+//     thread into withContext(Dispatchers.IO).
+//
 // vc=78 / 0.1.0-CL — perf-audit batch 1 (app-side):
 //   * Autoplay-next no longer drops the user's max-resolution cap. The
 //     enter-video track-selection reset built params from scratch, wiping
@@ -100,6 +108,6 @@ const val STRAW_SDK_TARGET = 35
 // vc=19 / 0.1.0-AE — rust pipeline cutover. Extraction via
 // strawcore-core (Sulkta-Coop/strawcore) via the UniFFI wrapper; no
 // NewPipeExtractor in the runtime path.
-const val STRAW_VERSION_CODE = 78
-const val STRAW_VERSION_NAME = "0.1.0-CL"
+const val STRAW_VERSION_CODE = 79
+const val STRAW_VERSION_NAME = "0.1.0-CM"
 const val STRAW_APPLICATION_ID = "com.sulkta.straw"