fix: tui tool render fix

[wangtsiao]

Summary

• Re-broadcast item/started for streamed tool calls once the assembled turn delivers complete arguments, so live clients render the running row's command instead of only seeing parameters at completion.
• Stabilize TUI tool rendering: one presentation owner per tool_use_id, live shell rows stay in the viewport for the whole turn, completion changes the title in place (Running -> Ran), and the turn boundary commits exactly one durable row. Missing authoritative results use the explicit result unavailable degraded state.
• Add the tool_call_param_refresh integration test covering streamed tool-call parameter refresh.

Test Plan

• cargo test -p devo-server (new tool_call_param_refresh test)
• TUI transcript and chatwidget unit tests