Bring the interactive site selector to pull-reprint

[epeicher]

Related issues

• Fixes STU-1811

Selector compared with previous one

How AI was used in this PR

Claude Code adapted the existing pull site selector (pickSyncSite) into a trimmed pull-reprint variant per the issue's guidance to copy rather than abstract (since pull is being deprecated), added unit tests for both the picker and the source-resolution flow, and verified the change — cli:build, typecheck, and the new test suites all pass. I reviewed the diff against the reference implementation and confirmed there are no behavior changes on the non-interactive paths.

Proposed Changes

When you run pull-reprint without --url and have more than one connected WordPress.com site, the command previously printed the list and aborted, forcing you to re-run with an explicit --url. Now, in an interactive terminal, it opens a searchable site picker (type to filter by name or hostname, arrow keys to navigate, Enter to select) — the same friendly selection experience already offered by pull. Cancelling with Esc or Ctrl-C is treated as a clean no-op: nothing is downloaded and no local state is created.

Existing behavior is preserved everywhere else: a single connected site is still auto-selected, the zero-site and --url/--secret paths are unchanged, and non-interactive callers (CI, the Desktop app driving the CLI) keep the original print-list-and-abort behavior so scripted usage is unaffected.

Testing Instructions

1. Authenticate with a WordPress.com account that has two or more connected sites (studio auth login).
2. From an interactive terminal, run:

   STUDIO_ENABLE_PULL_REPRINT=true node apps/cli/dist/cli/main.mjs pull-reprint --verbose
   

   (run npm run cli:build first)
3. Confirm the interactive picker appears. Type to filter, select a site, and verify the pull proceeds against the chosen site.
4. Re-run and press Esc (or Ctrl-C) at the picker — confirm it exits cleanly with no site created under ~/Studio/ and no state under ~/.studio/pulls/.
5. Regression checks: with a single connected site it should auto-select without prompting; piping to a non-TTY (e.g. ... pull-reprint | cat) should fall back to printing the list and aborting.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[wpmobilebot]

📊 Performance Test Results

Comparing e34606f vs trunk

app-size

Metric	trunk	e34606f	Diff	Change
App Size (Mac)	1358.09 MB	1358.09 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	e34606f	Diff	Change
load	1660 ms	1665 ms	+5 ms	⚪ 0.0%

site-startup

Metric	trunk	e34606f	Diff	Change
siteCreation	9043 ms	9063 ms	+20 ms	⚪ 0.0%
siteStartup	4396 ms	4398 ms	+2 ms	⚪ 0.0%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)