refactor(test): extract shared TUI test helpers

[kelsonpw]

Summary

• Add src/ui/tui/__tests__/helpers/ with strip-ansi.ts (stripAnsi + ANSI_CSI_REGEX / ANSI_OSC_REGEX) and render-frame.tsx (frameOf(node) render-strip-unmount shorthand).
• Migrate 21 TUI test files to use the shared helpers, removing ~19 copy-paste ANSI = /.../ + per-file stripAnsi definitions and 6 hand-rolled frameOf wrappers.
• snapshot-utils.tsx now reuses the shared stripAnsi.

No behavior changes: every callsite still strips CSI sequences; callers that previously stripped only CSI now also strip OSC (no-op on CSI-only frames, defensive on TTY-capable terminals — same rationale as snapshot-utils.tsx already used).

Follows up #814/#819 (mkdtempSync helper extraction) — same playbook applied to the next-largest cluster of duplication in TUI tests.

Patterns deferred (with reasons)

• FinalizingPanel.test.tsx — narrower SGR-only regex /[0-9;]*m/. Folding it in would broaden strip semantics for that file; left alone.
• new WizardStore(...) / per-file makeStore variants — 5 distinct signatures (4 take different Partial shapes; ActivityLine.makeStoreWithActivity is unique). A shared createTestStore would need careful design to not regress per-test setup; deferred.
• useStdoutDimensions mock — only 3 callsites and 2 already share via ink-stdin.tsx. Below the duplication threshold.
• await new Promise((r) => setTimeout(r, ...)) Ink-tick yielding — 41 instances across 10 files, but the delay values and surrounding wait conditions vary per case; a shared helper would force a one-size-fits-all timeout.

Test plan

• pnpm tsc --noEmit clean
• pnpm lint clean (prettier + eslint)
• pnpm test — all 298 files / 4473 tests pass
• All 21 migrated files pass individually under --pool=forks --maxWorkers=1
• Snapshot tests (AuthScreen.snap, OutroScreen.snap, RegionSelectScreen.snap) match unchanged

🤖 Generated with Claude Code

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Note

Low Risk
Test-only refactor that centralizes ANSI stripping and frame rendering; low risk aside from potential snapshot churn if OSC/CSI stripping semantics differ across environments.

Overview
Refactors TUI tests to use shared rendering/sanitization helpers. Adds __tests__/helpers/strip-ansi.ts (shared stripAnsi + CSI/OSC regexes) and __tests__/helpers/render-frame.tsx (frameOf() render→strip→unmount shortcut).

Updates TUI component/screen/primitive tests and snapshot-utils.tsx to remove per-file ANSI regexes and ad-hoc frameOf wrappers, standardizing on always stripping both CSI and OSC sequences for more deterministic snapshots across TTY vs CI runs.

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[kelsonpw]

Closing as part of pat-leave handoff to reduce open-PR load on the team. Branch preserved on origin — reopen if specific changes are wanted. The highest-impact wins from this refactor round already merged.