Improve messaging and dashboard reliability

tests/web/events/express-sse-adapter.test.ts

@@ -122,7 +122,7 @@ describe('createExpressSseHandler', () => {
     ]);
   });
 
-  it('replays the full available window when Last-Event-ID is absent', () => {
+  it('starts at the live edge when Last-Event-ID is absent', () => {
     const hub = createHub();
     hub.publish('log.created', { level: 'info', message: 'one' });
     hub.publish('log.created', { level: 'warn', message: 'two' });
@@ -134,10 +134,12 @@ describe('createExpressSseHandler', () => {
       vi.fn(),
     );
 
+    expect(response.frames).toEqual([': connected\n\n']);
+
+    hub.publish('log.created', { level: 'info', message: 'live' });
     expect(response.frames.map((frame) => frame.split('\n')[0])).toEqual([
       ': connected',
-      'id: event-1',
-      'id: event-2',
+      'id: event-3',
     ]);
   });