feat(tui): dock and refine effect approvals

[killswitch-GUI]

Summary

• move effect approvals into a compact dock above the preserved composer
• keep the transcript visible and retain the operator's draft while approval is pending
• present requester, action, resource, policy reason, and risk review as compact borderless rows
• add inspectable Summary, Exact request, and Protections sections
• use theme-resolved filled controls with an explicit unselected, fail-closed decision state
• preserve inline terminal scrollback when transient approval chrome closes

Why

The previous full-screen approval inspector displaced the conversation, exposed a debug-oriented nested table, clipped important risk context, and made unresolved choices look visually similar to successful state. The refined dock keeps decision context visible without weakening explicit confirmation or fail-closed cancellation behavior.

User impact

Operators can review an approval in context, inspect exact request and protection details, and respond without losing their draft or transcript position. The compact layout remains usable at the minimum supported 40×12 terminal size.

Verification

• cargo test -p colossus-tui --lib — 55 passed
• cargo xtask check rust — passed
• cargo build -p colossus-cli --bin colossus — passed

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[chatgpt-codex-connector]

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