feat(chat/activity): Self-improvement event badges for memory & skill updates (#744)

* feat(chat/activity): Self-improvement event badges for memory & skill updates (#737)

* feat(chat): Handle background review.summary WS events for self-improvement notices

---------

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

app/src/test/java/com/m57/hermescontrol/ui/system/SystemViewModelTest.kt

@@ -48,4 +48,11 @@ class SystemViewModelTest {
         viewModel.closeUpdateConfirm()
         assertFalse(viewModel.uiState.value.updateConfirmOpen)
     }
+
+    @Test
+    fun `initial uiState has null learningGraph`() {
+        val viewModel = SystemViewModel()
+
+        org.junit.Assert.assertNull(viewModel.uiState.value.learningGraph)
+    }
 }