fix(chat): give every backend-tagged system event its own timeline chip (#936)

System events ride as role=user rows with a display_kind sidecar (backend
issues #904/#82888). The full-bleed renderer routes any displayKind != null
to a SystemEvent, but timelineMarkerLabelRes only had labels for
model_switch / personality_switch / auto_continue / async_delegation_complete.
skill_invocation and internal_notification had NO label, so TimelineMarkerChip
returned early and they fell through to the bare SystemBubble (centered italic
text, no clear system identity) instead of a distinct chip.

- Add skill_invocation + internal_notification to timelineMarkerLabelRes.
- Add string resources en/zh/ko (ko was missing all timeline markers; added
  the two new ones for parity).
- TimelineMarkerTest: assert both new kinds map to labels.

Result: every backend system message type now renders as its own centered
timeline chip, never as a user bubble. Legacy sessions persisted before the
backend added display_kind tagging still lack the sidecar and would need a
one-time backend re-tag to stop rendering as user bubbles.

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

app/src/main/java/com/m57/hermescontrol/ui/chat/fullbleed/TimelineMarkerChip.kt

@@ -28,6 +28,8 @@ internal fun timelineMarkerLabelRes(kind: String?): Int? =
         "personality_switch" -> R.string.timeline_marker_personality_switch
         "auto_continue" -> R.string.timeline_marker_auto_continue
         "async_delegation_complete" -> R.string.timeline_marker_delegation_complete
+        "skill_invocation" -> R.string.timeline_marker_skill_invocation
+        "internal_notification" -> R.string.timeline_marker_internal_notification
         else -> null
     }
 

app/src/main/res/values-ko/strings.xml

@@ -752,4 +752,6 @@
     <string name="image_viewer_save_failed">이미지를 저장할 수 없음</string>
     <string name="image_viewer_load_failed">이미지를 불러올 수 없음: %1$s</string>
     <string name="image_viewer_share_failed">이미지를 공유할 수 없음</string>
+    <string name="timeline_marker_skill_invocation">스킬 호출됨</string>
+    <string name="timeline_marker_internal_notification">시스템 알림</string>
 </resources>

app/src/main/res/values-zh/strings.xml

@@ -979,6 +979,8 @@
     <string name="timeline_marker_personality_switch">人格已切换</string>
     <string name="timeline_marker_auto_continue">回合已自动继续</string>
     <string name="timeline_marker_delegation_complete">委派任务已完成</string>
+    <string name="timeline_marker_skill_invocation">技能已调用</string>
+    <string name="timeline_marker_internal_notification">系统通知</string>
     <string name="message_your_response">你的回复</string>
     <string name="moa_add_preset">添加预设</string>
     <string name="moa_add_reference">添加参考模型</string>

app/src/main/res/values/strings.xml

@@ -1102,6 +1102,8 @@
     <string name="timeline_marker_personality_switch">Personality switched</string>
     <string name="timeline_marker_auto_continue">Turn auto-continued</string>
     <string name="timeline_marker_delegation_complete">Delegated task completed</string>
+    <string name="timeline_marker_skill_invocation">Skill invoked</string>
+    <string name="timeline_marker_internal_notification">System notification</string>
     <string name="message_your_response">Your response</string>
     <string name="moa_add_preset">Add preset</string>
     <string name="moa_add_reference">Add reference model</string>

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

@@ -18,6 +18,14 @@ class TimelineMarkerTest {
             R.string.timeline_marker_delegation_complete,
             timelineMarkerLabelRes("async_delegation_complete"),
         )
+        assertEquals(
+            R.string.timeline_marker_skill_invocation,
+            timelineMarkerLabelRes("skill_invocation"),
+        )
+        assertEquals(
+            R.string.timeline_marker_internal_notification,
+            timelineMarkerLabelRes("internal_notification"),
+        )
     }
 
     @Test