logging: address review of the breadcrumbs

Drop the non-distinct song comparison (sum of album song counts double-counts compilations), skip redaction for dropped lines via a level check, defer the startup prune off the main thread and cap the writer queue, and only warn about a stall against the still-current player. Reward the scrobble info line and cover the new preferences/level toggles with tests.

app/src/test/kotlin/com/subtracks/data/prefs/UserPreferencesTest.kt

@@ -173,6 +173,21 @@ class UserPreferencesTest {
             prefs.setLastSeed(ArtworkSeedValue("art:2", 0xFF778899.toInt(), null))
             assertEquals(ArtworkSeedValue("art:2", 0xFF778899.toInt(), null), prefs.lastSeed())
 
+            file.delete()
+        }
+
+    @Test
+    fun verboseLoggingDefaultsOffAndRoundTrips() =
+        runTest {
+            val file = File.createTempFile("user-prefs", ".preferences_pb").apply { delete() }
+            val store = PreferenceDataStoreFactory.create(scope = backgroundScope) { file }
+            val prefs = UserPreferences(store)
+
+            assertEquals(false, prefs.verboseLogging().first())
+
+            prefs.setVerboseLogging(true)
+            assertEquals(true, prefs.verboseLogging().first())
+
             file.delete()
         }
 }

app/src/test/kotlin/com/subtracks/log/LogFileStoreTest.kt

@@ -86,6 +86,19 @@ class LogFileStoreTest {
         assertTrue(text, text.contains("loud"))
     }
 
+    @Test
+    fun setMinLevelChangesWhatIsWritten() {
+        val store = LogFileStore(root, LogLevel.WARN)
+        store.setMinLevel(LogLevel.VERBOSE)
+        store.write(LogLevel.VERBOSE, "x", "verbose-line", null)
+        store.setMinLevel(LogLevel.ERROR)
+        store.write(LogLevel.INFO, "x", "info-line", null)
+        store.flush()
+        val text = store.files().single().readText()
+        assertTrue(text, text.contains("verbose-line"))
+        assertFalse(text, text.contains("info-line"))
+    }
+
     @Test
     fun rotatesWhenFileExceedsCap() {
         val store = LogFileStore(root, LogLevel.VERBOSE, maxFileBytes = 1)