fix(tui): stabilize live todo progress

ui-tui/src/lib/liveProgress.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, it } from 'vitest'
+
+import { appendToolShelfMessage, isTodoDone } from './liveProgress.js'
+
+describe('isTodoDone', () => {
+  it('only treats non-empty all-completed/cancelled lists as done', () => {
+    expect(isTodoDone([])).toBe(false)
+    expect(isTodoDone([{ content: 'x', id: 'x', status: 'completed' }])).toBe(true)
+    expect(isTodoDone([{ content: 'x', id: 'x', status: 'in_progress' }])).toBe(false)
+    expect(
+      isTodoDone([
+        { content: 'x', id: 'x', status: 'completed' },
+        { content: 'y', id: 'y', status: 'cancelled' }
+      ])
+    ).toBe(true)
+  })
+})
+
+describe('appendToolShelfMessage', () => {
+  it('merges adjacent tool shelves into one contextual shelf', () => {
+    const merged = appendToolShelfMessage([{ kind: 'trail', role: 'system', text: '', tools: ['one ✓'] }], {
+      kind: 'trail',
+      role: 'system',
+      text: '',
+      tools: ['two ✓']
+    })
+
+    expect(merged).toEqual([{ kind: 'trail', role: 'system', text: '', tools: ['one ✓', 'two ✓'] }])
+  })
+
+  it('adds tools to the nearest contextual thinking shelf', () => {
+    const merged = appendToolShelfMessage(
+      [{ kind: 'trail', role: 'system', text: '', thinking: 'plan', tools: ['one ✓'] }],
+      { kind: 'trail', role: 'system', text: '', tools: ['two ✓'] }
+    )
+
+    expect(merged).toEqual([{ kind: 'trail', role: 'system', text: '', thinking: 'plan', tools: ['one ✓', 'two ✓'] }])
+  })
+
+  it('starts a new shelf across assistant text boundaries', () => {
+    const merged = appendToolShelfMessage(
+      [{ kind: 'trail', role: 'system', text: '', tools: ['one ✓'] }, { role: 'assistant', text: 'done' }],
+      { kind: 'trail', role: 'system', text: '', tools: ['two ✓'] }
+    )
+
+    expect(merged).toHaveLength(3)
+  })
+})