feat(ai-harness): add branch-coverage tests for ai-harness-view.tsx

[d-oit]

Branch Coverage: ai-harness-view.tsx (38.88% -> ~65% branches)

What

12 targeted tests covering key branches in the ai-harness-view.tsx component.

Coverage Areas

Area	Tests
Input guards	empty input not sent
API key handling	missing-key error toast
Message streaming	successful stream send, chunk display
Error handling	throw adds error message, abort handled silently
Rate limiting	rate-limited assistant message
Web research	URL fetch when enabled
Settings	auto-save after load
Ollama models	refresh fetch, empty fallback to defaults

Notes

• Uses vi.hoisted() for all mock factories (fixes Vitest TDZ on hoisted vi.mock references)
• Mocks: framer-motion, lucide-react, sonner, cn, ai-settings, use-reduced-motion, @/lib/ai, @/lib/ai/types, @/lib/ai/research, ai-harness-settings, shared-primitives, store

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Project	Deployment	Actions	Updated (UTC)
do-knowledge-studio	Ready	Preview, v0	Jul 31, 2026 8:54am

[codacy-production]

Up to standards ✅

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