feat(#525): render reasoning.delta / reasoning.available stream (#543)

* feat(#525): add ReasoningDelta + ReasoningAvailable WsEvent types

* feat(#525): parse reasoning.delta + reasoning.available; route through reducer + StreamingState

* feat(#525): add reasoning streaming buffer to ChatStreamingController

* feat(#525): dispatch ReasoningDelta/ReasoningAvailable in ChatViewModel

* feat(#525): render collapsible ReasoningIndicator in chat list

* fix(#525): address review — icons+semantics, LocalHermesStatusColors, drop redundant ReasoningAvailable branch

* feat(#525): persist reasoningText on model, entity, mapper + Room migration 3->4

* feat(#525): reducer + streaming carry reasoningText onto message

* feat(#525): render persisted reasoning above each assistant bubble, drop global indicator

* nix: flake

* nix: flake

---------

Co-authored-by: M57 <m57@hermes-control.app>

app/src/main/java/com/m57/hermescontrol/data/ws/EventParser.kt

@@ -62,6 +62,15 @@ object EventParser {
                 WsEvent.ThinkingDelta(token, sessionId)
             }
 
+            "reasoning.delta" -> {
+                val token = payload?.get("text") as? String ?: ""
+                WsEvent.ReasoningDelta(token, sessionId)
+            }
+
+            "reasoning.available" -> {
+                WsEvent.ReasoningAvailable(sessionId)
+            }
+
             "message.complete" -> {
                 val text = payload?.get("text") as? String ?: ""
                 WsEvent.MessageComplete(text, sessionId)

app/src/main/java/com/m57/hermescontrol/data/ws/WsEvent.kt

@@ -30,6 +30,15 @@ sealed class WsEvent {
         val sessionId: String?,
     ) : WsEvent()
 
+    data class ReasoningDelta(
+        val token: String,
+        val sessionId: String?,
+    ) : WsEvent()
+
+    data class ReasoningAvailable(
+        val sessionId: String?,
+    ) : WsEvent()
+
     data class MessageComplete(
         val text: String,
         val sessionId: String?,