Show persistent timestamps for operation and teacher messages

electron/coding-runtime/pi/event-projector.ts

@@ -1,3 +1,4 @@
+import { messageTimestamp } from '../../../shared/message-timestamp';
 import type {
   ConversationContentBlock,
   ConversationMessageNode,
@@ -529,6 +530,7 @@ export class PiEventProjector {
               ? { clientRequestId: optimistic.clientRequestId }
               : {}),
             role: 'user',
+            timestamp: messageTimestamp(message.timestamp) ?? optimistic?.timestamp ?? this.now(),
             status: 'complete',
             blocks: await liveContentBlocks(
               id,
@@ -723,6 +725,8 @@ export class PiEventProjector {
           kind: 'message',
           id,
           role: 'assistant',
+          // Live observation; settlement hydration replaces it with Pi's durable entry time.
+          timestamp: this.now(),
           status: message.stopReason === 'aborted'
             ? 'aborted'
             : message.stopReason === 'error' ? 'error' : 'complete',

electron/coding-runtime/pi/runtime.ts

@@ -814,6 +814,7 @@ export class PiConversationRuntime implements CodingConversationRuntime {
         id: messageId,
         clientRequestId: input.clientRequestId,
         role: 'user',
+        timestamp: this.now(),
         status: 'optimistic',
         blocks: [
           ...(input.text.length > 0

electron/coding-runtime/pi/session-projector.ts

@@ -1,3 +1,4 @@
+import { messageTimestamp } from '../../../shared/message-timestamp';
 import type {
   CodingRuntimeErrorCode,
   ConversationContentBlock,
@@ -235,6 +236,10 @@ async function projectEntries(
       id: messageId,
       sourceEntryId: entry.id,
       role: message.role,
+      // Pi appends the entry on message_end; assistant.message.timestamp is its start time.
+      timestamp: message.role === 'user'
+        ? messageTimestamp(message.timestamp) ?? messageTimestamp(entry.timestamp)
+        : messageTimestamp(entry.timestamp),
       status: message.stopReason === 'aborted'
         ? 'aborted'
         : message.stopReason === 'error' ? 'error' : 'complete',

electron/coding-teacher/service.ts

@@ -671,7 +671,8 @@ export class CodingTeacherService {
             current.response = '';
             delete current.suggestedQuestions;
           }
-          topic.updatedAt = new Date().toISOString();
+          current.finishedAt = new Date().toISOString();
+          topic.updatedAt = current.finishedAt;
           topic.revision++;
           try {
             await store.save(topic, current.id);