feat(codex): make terminal animations configurable

[Lint111]

Summary

• Add an opt-in “Animated Status Effects” switch to Codex CLI settings.
• Persist the preference through the strict settings schema.
• Carry the value in CodexConfig for new local sessions.
• Launch Codex with --config tui.animations=true|false.

Motivation

Codex's decorative TUI animations create frequent redraws that are expensive and visually noisy over mobile or remote terminal streaming. Users can now choose the native Codex behavior, with animations disabled by default for newly launched Codex sessions.

Scope

This is the Codex animation-preference slice extracted from #173. It includes the UI, persistence and request schemas, session type, command builder, and focused tests. It does not change terminal rendering or suppress output in Codeman.

Validation

• npx vitest run --config config/vitest.config.ts test/run-mode-ui.test.ts test/tmux-manager.test.ts: 61 passed
• Focused Playwright probe: control defaulted off, saved on, and remained on after page reload
• npm run build: passed
• Commit formatting hook: passed
• git diff --check: passed

Existing browser-suite debt

test/mobile/settings.test.ts reported 17 passes and two failures in unrelated subagentTrackingEnabled expectations. The identical two failures reproduce on untouched origin/master; this branch does not change those settings.