fix(chat): keep context meter aligned after model swaps (#1103)

app/src/test/java/com/m57/hermescontrol/data/model/ContextBreakdownResponseTest.kt

@@ -84,4 +84,24 @@ class ContextBreakdownResponseTest {
         assertEquals(262144L, parsed?.contextMax)
         assertEquals(0, parsed?.contextPercent)
     }
+
+    @Test
+    fun `JsonObject and JsonPrimitive payloads parse successfully`() {
+        val json =
+            kotlinx.serialization.json.buildJsonObject {
+                put("context_used", kotlinx.serialization.json.JsonPrimitive(52428))
+                put("context_max", kotlinx.serialization.json.JsonPrimitive(524288))
+                put("context_percent", kotlinx.serialization.json.JsonPrimitive(10))
+                put("estimated_total", kotlinx.serialization.json.JsonPrimitive(52428))
+                put("model", kotlinx.serialization.json.JsonPrimitive("upstage/solar-pro4:free"))
+            }
+
+        val parsed = parseContextBreakdown(json)
+
+        assertEquals(52428L, parsed?.contextUsed)
+        assertEquals(524288L, parsed?.contextMax)
+        assertEquals(10, parsed?.contextPercent)
+        assertEquals(52428L, parsed?.estimatedTotal)
+        assertEquals("upstage/solar-pro4:free", parsed?.model)
+    }
 }

app/src/test/java/com/m57/hermescontrol/data/model/UsageSnapshotResponseTest.kt

@@ -30,4 +30,24 @@ class UsageSnapshotResponseTest {
         assertNull(parseUsageSnapshot("oops"))
         assertNull(parseUsageSnapshot(listOf(1.0)))
     }
+
+    @Test
+    fun `JsonObject and JsonPrimitive payloads parse successfully`() {
+        val json =
+            kotlinx.serialization.json.buildJsonObject {
+                put("compressions", kotlinx.serialization.json.JsonPrimitive(3))
+                put("context_used", kotlinx.serialization.json.JsonPrimitive(12000))
+                put("context_max", kotlinx.serialization.json.JsonPrimitive(200000))
+                put("total", kotlinx.serialization.json.JsonPrimitive(50000))
+                put("avg_tps", kotlinx.serialization.json.JsonPrimitive(45.5))
+            }
+
+        val parsed = parseUsageSnapshot(json)
+
+        assertEquals(3, parsed?.compressions)
+        assertEquals(12000L, parsed?.contextUsed)
+        assertEquals(200000L, parsed?.contextMax)
+        assertEquals(50000L, parsed?.totalTokens)
+        assertEquals(45.5, parsed?.avgTps ?: 0.0, 0.001)
+    }
 }