refactor(v027): OllamaSettingsModal 제거 + onOpenOllamaSettings 채널 cleanup

tests/unit/App.test.tsx

@@ -19,7 +19,6 @@ vi.mock('../../src/renderer/inbox/api.js', () => ({
     listRecallCandidate: vi.fn(async () => null),
     onNoteUpdated: vi.fn(() => () => undefined),
     onOllamaStatus: vi.fn(() => () => undefined),
-    onOpenOllamaSettings: vi.fn(() => () => undefined),
     onNavigate: vi.fn(() => () => undefined),
     // 4 섹션 mounted 시 호출되는 stub
     loadOllamaSettings: vi.fn(async () => ({ endpoint: '', model: '' })),