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## Why Issue #20489 calls out that animated TUI affordances can be noisy for screen-reader users. Codex already has `tui.animations = false` as a reduced-motion setting, but some live activity rows render spinner-style prefixes in that mode. These were relatively recent regressions. We have also regressed this pattern more than once by adding new spinner/shimmer callsites that do not think through the reduced-motion path, so this PR adds a small guardrail while fixing the current surfaces. ## What changed - Omit the live status-row spinner when animations are disabled, so the row starts with stable text like `Working (...)`. - Render running hook headers without the spinner prefix when animations are disabled, while preserving shimmer/spinner behavior when animations are enabled. - Centralize TUI activity indicators in `tui/src/motion.rs`, with explicit reduced-motion choices for hidden prefixes, static bullets, and plain shimmer-text fallbacks. - Route existing spinner/shimmer callsites through the central motion helper, including exec rows, MCP/web-search/loading rows, hook rows, plugin loading, and onboarding loading text. - Add a source-scan regression test that rejects direct `spinner(...)` or `shimmer_spans(...)` usage outside the central module and primitive definition. - Add focused coverage that reduced-motion active exec rows are stable, status rows start without a spinner, running hooks omit the spinner, and MCP inventory loading stays stable. - Update the one affected status-indicator snapshot; the existing detail tree prefix remains unchanged. ## Verification - `cargo test -p codex-tui`