fix(web): de-ugly the Tier-3 persona pane — clear message instead of bare HTTP 404
persona_state hard-404s every Tier-3 (colon-id) agent by design upstream (WT api.py:1220, "Phase 2.0 has no Tier 3 persona") — so the Persona pane showed "persona not available (HTTP 404)" for consumer-defined characters. loadPersona now reads error_code + renders a clear Tier-3-aware message (she still responds in character; only the affect/OCEAN readout is gated), with distinct text for persona_not_configured / 403 / other. Also (snapshot): sindra switched to thoughtful-character role (mistral-small-4-reasoning); worldtree-dev pinged re Tier-3 persona_state roadmap (thread 01KVCR6P); #17 (bifrost-binding the chat client) teed up as the next-context target. v0.17.7
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