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/test/java/com/m57/hermescontrol/data/ws/EventParserTest.kt

@@ -166,6 +166,48 @@ class EventParserTest {
         assertEquals("session-2", deltaEvent.sessionId)
     }
 
+    @Test
+    fun testParseReasoningDelta_returnsReasoningDeltaEvent() {
+        val response =
+            createJsonRpcResponse(
+                jsonrpc = "2.0",
+                id = null,
+                result = null,
+                error = null,
+                method = "event",
+                params =
+                    mapOf(
+                        "type" to "reasoning.delta",
+                        "payload" to mapOf("text" to "reasoning token", "session_id" to "session-r1"),
+                    ),
+            )
+        val event = EventParser.parse(response)
+        assertTrue(event is WsEvent.ReasoningDelta)
+        val deltaEvent = event as WsEvent.ReasoningDelta
+        assertEquals("reasoning token", deltaEvent.token)
+        assertEquals("session-r1", deltaEvent.sessionId)
+    }
+
+    @Test
+    fun testParseReasoningAvailable_returnsReasoningAvailableEvent() {
+        val response =
+            createJsonRpcResponse(
+                jsonrpc = "2.0",
+                id = null,
+                result = null,
+                error = null,
+                method = "event",
+                params =
+                    mapOf(
+                        "type" to "reasoning.available",
+                        "payload" to mapOf("session_id" to "session-r1"),
+                    ),
+            )
+        val event = EventParser.parse(response)
+        assertTrue(event is WsEvent.ReasoningAvailable)
+        assertEquals("session-r1", (event as WsEvent.ReasoningAvailable).sessionId)
+    }
+
     @Test
     fun testParseClarifyRequest_returnsClarifyRequestEvent() {
         val response =