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"

strawApp/src/main/kotlin/com/sulkta/straw/feature/player/PlaybackService.kt

@@ -128,7 +128,13 @@ class PlaybackService : MediaSessionService() {
         // without requiring a service restart. The initial value was
         // baked in via the builder above — this picks up subsequent
         // flips.
-        settingsWatcherJob = StrawApp.globalScope.launch {
+        // MUST run on Main: globalScope is Dispatchers.IO, but ExoPlayer is
+        // thread-affine to the Main thread it was built on (onCreate), so
+        // touching it (setHandleAudioBecomingNoisy) off-Main throws
+        // "Player is accessed on the wrong thread" — and this hot StateFlow
+        // emits on first subscription, i.e. every service start. Mirrors
+        // resumePollJob below.
+        settingsWatcherJob = StrawApp.globalScope.launch(Dispatchers.Main) {
             Settings.get().pauseOnHeadphoneDisconnect.collect { handle ->
                 player.setHandleAudioBecomingNoisy(handle)
             }

strawApp/src/main/kotlin/com/sulkta/straw/feature/search/SearchViewModel.kt

@@ -237,7 +237,8 @@ class SearchViewModel : ViewModel() {
                 }
                 // Record AFTER the search succeeds so mistyped queries
                 // that error out don't pollute the recent-searches list.
-                runCatching { History.get().recordSearch(q) }
+                // Off Main — recordSearch json-encodes + writes SharedPrefs.
+                withContext(Dispatchers.IO) { runCatching { History.get().recordSearch(q) } }
                 if (Settings.get().cacheEnabled.value) {
                     withContext(Dispatchers.IO) {
                         // Re-check active state after the dispatcher