fix(chat): send omit_messages=true on session.resume (issue #842) (#844)

The gateway replays the full transcript over a new socket on
session.resume unless omit_messages is set; mobile hydrates history via
REST in parallel, so the replay is redundant. When a reconnect lands
mid-stream, the replayed message gets a fresh UUID and dedup can't
collapse the 90% orphan with the 100% replay (different ids + content),
leaving a duplicate bubble. Desktop already sends omit_messages: true;
mirror that in both resume paths (ChatViewModel + NotificationReplyReceiver)
and pin it in the exact-map test verifies.

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

app/src/test/java/com/m57/hermescontrol/notification/NotificationReplyReceiverTest.kt

@@ -306,7 +306,11 @@ class NotificationReplyReceiverTest {
         Thread.sleep(500)
 
         verify {
-            HermesWsClient.request(WsMethods.SESSION_RESUME, match { it["session_id"] == "session-abc" }, any())
+            HermesWsClient.request(
+                WsMethods.SESSION_RESUME,
+                match { it["session_id"] == "session-abc" && it["omit_messages"] == true },
+                any(),
+            )
             HermesWsClient.request(
                 WsMethods.PROMPT_SUBMIT,
                 match { it["session_id"] == "runtime-session-abc" },

app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt

@@ -642,7 +642,7 @@ class ChatViewModelTest {
             verify {
                 HermesWsClient.send(
                     WsMethods.SESSION_RESUME,
-                    mapOf("session_id" to "session-from-notification"),
+                    mapOf("session_id" to "session-from-notification", "omit_messages" to true),
                     any(),
                 )
             }
@@ -1271,7 +1271,13 @@ class ChatViewModelTest {
                     .isEmpty(),
             )
 
-            verify { HermesWsClient.send(WsMethods.SESSION_RESUME, mapOf("session_id" to "session-456"), any()) }
+            verify {
+                HermesWsClient.send(
+                    WsMethods.SESSION_RESUME,
+                    mapOf("session_id" to "session-456", "omit_messages" to true),
+                    any(),
+                )
+            }
         }
 
     @Test
@@ -1894,7 +1900,7 @@ class ChatViewModelTest {
             verify {
                 HermesWsClient.send(
                     WsMethods.SESSION_RESUME,
-                    mapOf("session_id" to "session-456"),
+                    mapOf("session_id" to "session-456", "omit_messages" to true),
                     any(),
                 )
             }