feat: add source field to messages for system notifications

- Enhanced TeamDataService to include a 'source' field in message payloads, specifically for system notifications.
- Updated InboxMessage type to accommodate the new 'system_notification' source.
- Modified TeamInboxWriter to conditionally include the source field in the message payload.
- Added tests to verify the inclusion and omission of the source field based on request parameters.

src/main/services/team/TeamDataService.ts

@@ -862,6 +862,7 @@ export class TeamDataService {
             from: leadName,
             text: parts.join('\n'),
             summary: `New task #${task.id} assigned`,
+            source: 'system_notification',
           });
         }
       } catch {
@@ -906,6 +907,7 @@ export class TeamDataService {
             from: leadName,
             text: parts.join('\n'),
             summary: `Task #${task.id} started`,
+            source: 'system_notification',
           });
         }
       } catch {
@@ -961,6 +963,7 @@ export class TeamDataService {
         from: last.actor,
         text: `Task #${task.id} "${task.subject}" has been started by ${last.actor}.`,
         summary: `Task #${task.id} started`,
+        source: 'system_notification',
       });
     } catch (error) {
       logger.warn(`[TeamDataService] notifyLeadOnTeammateTaskStart failed: ${String(error)}`);
@@ -1072,6 +1075,7 @@ export class TeamDataService {
           from: leadName,
           text: parts.join('\n'),
           summary: `Comment on #${taskId}`,
+          source: 'system_notification',
         });
       } else if (task && owner && this.isLeadOwner(owner, leadName)) {
         // Notify lead about user's comment on their own task.
@@ -1088,6 +1092,7 @@ export class TeamDataService {
           from: 'user',
           text: parts.join('\n'),
           summary: `Comment on #${taskId}`,
+          source: 'system_notification',
         });
       }
     } catch {
@@ -1208,6 +1213,7 @@ export class TeamDataService {
           `node "${toolPath}" --team ${teamName} review request-changes ${taskId} --comment "..."\n` +
           AGENT_BLOCK_CLOSE,
         summary: `Review request for #${taskId}`,
+        source: 'system_notification',
       });
     } catch (error) {
       await this.kanbanManager
@@ -1307,6 +1313,7 @@ export class TeamDataService {
     for (const msg of messages) {
       if (!msg.messageId || !msg.summary || msg.from === 'user') continue;
       if (msg.source === 'lead_session' || msg.source === 'lead_process') continue;
+      if (msg.source === 'system_notification') continue;
       if (isAutomatedCommentNotification(msg)) continue;
 
       const textKey = `${msg.from}\0${msg.text}`;
@@ -1490,6 +1497,7 @@ export class TeamDataService {
           `${patch.comment?.trim() || 'Reviewer requested changes.'}\n\n` +
           `Please fix and mark it as completed when ready.`,
         summary: `Fix request for #${taskId}`,
+        source: 'system_notification',
       });
     } catch (error) {
       await this.taskWriter

src/main/services/team/TeamInboxWriter.ts

@@ -29,6 +29,7 @@ export class TeamInboxWriter {
       summary: request.summary,
       messageId,
       attachments: attachmentMeta?.length ? attachmentMeta : undefined,
+      ...(request.source && { source: request.source }),
     };
 
     await withInboxLock(inboxPath, async () => {

src/renderer/components/team/TeamDetailView.tsx

@@ -1416,28 +1416,25 @@ export const TeamDetailView = ({ teamName }: TeamDetailViewProps): React.JSX.Ele
                 : undefined
             }
             headerExtra={
-              <Tooltip>
-                <TooltipTrigger asChild>
-                  <Button
-                    variant="ghost"
-                    size="sm"
-                    className="pointer-events-auto size-6 p-0 text-[var(--color-text-muted)] hover:text-[var(--color-text-secondary)]"
-                    onClick={(e) => {
-                      e.stopPropagation();
-                      void window.electronAPI.openExternal(
-                        'https://github.com/777genius/claude-notifications-go'
-                      );
-                    }}
-                  >
-                    <Bell size={12} />
-                  </Button>
-                </TooltipTrigger>
-                <TooltipContent side="top">Desktop notifications plugin</TooltipContent>
-              </Tooltip>
-            }
-            defaultOpen
-            action={
-              <div className="flex items-center gap-2 pl-2">
+              <>
+                <Tooltip>
+                  <TooltipTrigger asChild>
+                    <Button
+                      variant="ghost"
+                      size="sm"
+                      className="pointer-events-auto size-6 p-0 text-[var(--color-text-muted)] hover:text-[var(--color-text-secondary)]"
+                      onClick={(e) => {
+                        e.stopPropagation();
+                        void window.electronAPI.openExternal(
+                          'https://github.com/777genius/claude-notifications-go'
+                        );
+                      }}
+                    >
+                      <Bell size={12} />
+                    </Button>
+                  </TooltipTrigger>
+                  <TooltipContent side="top">Desktop notifications plugin</TooltipContent>
+                </Tooltip>
                 {messagesUnreadCount > 0 && (
                   <Tooltip>
                     <TooltipTrigger asChild>
@@ -1455,6 +1452,11 @@ export const TeamDetailView = ({ teamName }: TeamDetailViewProps): React.JSX.Ele
                     <TooltipContent side="bottom">Mark all as read</TooltipContent>
                   </Tooltip>
                 )}
+              </>
+            }
+            defaultOpen
+            action={
+              <div className="flex items-center gap-2 pl-2">
                 <div className="flex w-36 items-center gap-1.5 rounded-md border border-[var(--color-border)] bg-transparent px-2 py-1">
                   <Search size={12} className="shrink-0 text-[var(--color-text-muted)]" />
                   <input

src/renderer/components/team/activity/ActivityTimeline.tsx

@@ -290,10 +290,13 @@ export const ActivityTimeline = ({
           const currSessionId = getItemSessionId(item);
           if (prevSessionId && currSessionId && prevSessionId !== currSessionId) {
             sessionSeparator = (
-              <div className="flex items-center gap-3 py-4">
+              <div
+                className="flex items-center gap-3"
+                style={{ paddingTop: 30, paddingBottom: 30 }}
+              >
                 <div className="h-px flex-1 bg-[var(--color-border-emphasis)]" />
                 <span className="whitespace-nowrap text-[11px] text-[var(--color-text-muted)]">
-                  Новая сессия
+                  New session
                 </span>
                 <div className="h-px flex-1 bg-[var(--color-border-emphasis)]" />
               </div>

src/shared/types/team.ts

@@ -195,7 +195,7 @@ export interface InboxMessage {
   summary?: string;
   color?: string;
   messageId?: string;
-  source?: 'inbox' | 'lead_session' | 'lead_process' | 'user_sent';
+  source?: 'inbox' | 'lead_session' | 'lead_process' | 'user_sent' | 'system_notification';
   attachments?: AttachmentMeta[];
   /** Lead session ID that produced this message (for session boundary detection). */
   leadSessionId?: string;
@@ -207,6 +207,7 @@ export interface SendMessageRequest {
   summary?: string;
   from?: string;
   attachments?: AttachmentPayload[];
+  source?: InboxMessage['source'];
 }
 
 export interface SendMessageResult {

test/main/services/team/TeamInboxWriter.test.ts

@@ -130,4 +130,28 @@ describe('TeamInboxWriter', () => {
     expect(persisted).toHaveLength(2);
     expect(persisted.map((row) => row.text).sort()).toEqual(['first', 'second']);
   });
+
+  it('includes source field in payload when provided in request', async () => {
+    await writer.sendMessage('my-team', {
+      member: 'alice',
+      text: 'task assigned',
+      summary: 'New task #1 assigned',
+      source: 'system_notification',
+    });
+
+    const persisted = JSON.parse(hoisted.files.get(inboxPath) ?? '[]') as Record<string, unknown>[];
+    expect(persisted).toHaveLength(1);
+    expect(persisted[0].source).toBe('system_notification');
+  });
+
+  it('omits source field from payload when not provided in request', async () => {
+    await writer.sendMessage('my-team', {
+      member: 'alice',
+      text: 'hello',
+    });
+
+    const persisted = JSON.parse(hoisted.files.get(inboxPath) ?? '[]') as Record<string, unknown>[];
+    expect(persisted).toHaveLength(1);
+    expect(persisted[0]).not.toHaveProperty('source');
+  });
 });