perf(#281): fix PERF-13/14/15/16 — main-thread settings, 100Hz polling, leaked scope, WS disconnect (#359)

* perf(#281): fix PERF-13/14/15/16 — main-thread settings load, 100Hz polling, leaked scope, WS disconnect

* fix(#281): fix SettingsViewModelTest failures from async init dispatcher

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Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt

@@ -797,10 +797,11 @@ private fun StreamingBubbleWithTypingEffect(
 
     // Timer that ticks at the configured delay, incrementing the visible word
     // count each tick. Stops ticking when streaming ends, then shows all words.
+    // Optimized: split is only called when waiting for new content, not per tick.
     LaunchedEffect(Unit) {
+        var wordCount = 0
         while (true) {
-            val words = currentContent.value.split(" ")
-            if (visibleWordCount < words.size) {
+            if (visibleWordCount < wordCount) {
                 delay(currentDelayMs.value.toLong())
                 visibleWordCount++
             } else {
@@ -808,7 +809,11 @@ private fun StreamingBubbleWithTypingEffect(
                     onAnimationComplete()
                     break
                 }
-                delay(10)
+                // Only split when we need to check for new content arriving
+                val words = currentContent.value.split(" ")
+                wordCount = words.size
+                if (visibleWordCount < wordCount) continue
+                delay(100) // was 10 — reduced from 100Hz to 10Hz
             }
         }
         visibleWordCount = Int.MAX_VALUE

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt

@@ -1020,7 +1020,8 @@ class ChatViewModel(
     override fun onCleared() {
         super.onCleared()
         pendingCleanupJob?.cancel()
-        wsClient.disconnect()
+        // PERF-16: Don't disconnect the global HermesWsClient singleton when
+        // leaving the Chat screen — it's used by background notification reply.
     }
 
     companion object {