fix(chat): group run output and hide empty messages

tests/client/chat-group-run-messages.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'vitest'
+import { groupRunMessages } from '../../packages/client/src/components/hermes/chat/groupRunMessages'
+import type { Message } from '../../packages/client/src/stores/hermes/chat'
+
+const message = (id: string, role: Message['role'], content = ''): Message => ({ id, role, content, timestamp: 1 })
+
+describe('groupRunMessages', () => {
+  it('groups text across tool calls and marks completion only when the run ends', () => {
+    const input = [message('u', 'user', 'question'), message('a', 'assistant', 'first'), message('t', 'tool'), message('b', 'assistant', 'second')]
+    const active = groupRunMessages(input, true)
+    expect(active.map(m => m.role)).toEqual(['user', 'assistant', 'tool'])
+    expect(active[1]).toMatchObject({ id: 'b', content: 'first\n\nsecond' })
+    const finished = groupRunMessages(input, false)
+    expect(finished.at(-1)?.systemType).toBe('run-end')
+  })
+
+  it('keeps separate user turns and explicit run markers separate', () => {
+    const input = [message('u', 'user'), { ...message('a', 'assistant', 'one'), runMarker: '1' }, { ...message('b', 'assistant', 'two'), runMarker: '2' }, message('u2', 'user'), message('c', 'assistant', 'three')]
+    expect(groupRunMessages(input, false).filter(m => m.role === 'assistant').map(m => m.content)).toEqual(['one', 'two', 'three'])
+    expect(groupRunMessages(input, false).filter(m => m.systemType === 'run-end')).toHaveLength(3)
+  })
+})