fix(cli): clean up interactive terminal transitions

[aidenybai]

Why

Two adjacent interactive transitions left the terminal in the wrong state:

• Ctrl-C correctly suppressed the duplicate completed-scan footer, but clearing the active Ink renderer also erased the final score and results from terminal history.
• In large workspaces, project selection rendered inline at viewport height, so selector rows entered scrollback and remained above scanning after submission.

After: project selection is disposable, while scan results are durable. Choosing a project restores the normal terminal before scanning; cancelling a completed report keeps its final score/results visible and appends exactly one cancellation footer.

Product brief:

• Job: let an interactive CLI user select a workspace target and later cancel without leaving setup UI behind or losing the result they were reviewing.
• Change: isolate only project selection in the terminal's alternate screen and preserve the final report on normal terminal history.
• Reuse: use Ink's existing alternateScreen, active-renderer lifecycle, and idempotent disposal instead of introducing another renderer or output mode.
• Metric: record the affected selector cohort with tui.project_select_shown; retain the existing tui.cancelled counter for cancellation behavior.
• Compatibility: patch changeset only; no flags, config, report schema, score, package API, or GitHub Action behavior changes.
• Kill signal: revert if interactive cancellation/error telemetry rises after release or the PTY regressions stop proving a disposable selector and durable final report.

What changed

• render project selection on a disposable alternate screen, then restore the normal terminal before scanning
• keep scanning and final reports inline so useful output remains in terminal history
• unmount the active report without clearing it during signal cancellation
• prevent later scan cleanup from erasing a preserved report frame
• replace the obsolete inline-selector metric with the mode-neutral tui.project_select_shown
• cover selector/report renderer boundaries and cancellation lifecycle races

Test plan

• nr test
• nr lint
• nr typecheck
• nr format:check
• nr smoke:json-report
• npx -y react-doctor@latest --verbose --scope changed
• real 14-package PTY at 12 rows: Enter from project selection restores the normal terminal before scanning and leaves no selector rows in history
• real 14-package PTY at 12 rows: Ctrl-C from project selection restores the normal terminal before printing one cancellation footer
• real Next.js PTY: full report → issue review → back → Ctrl-C keeps the final score/results visible and prints one Cancelled. footer

[pkg-pr-new]

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commit: 1fab119

[github-actions]

React Doctor found no new issues. 🎉

_{Reviewed by React Doctor for commit 1fab119.}

[github-actions]

Interactive terminal E2E

Recorded from the built CLI at 1fab119 in a real terminal. The fixture holds Git busy for three seconds, so Scanning... must appear immediately after project selection, then exercises the compact interactive report.

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