fix(init): add --app flag and actionable errors for non-interactive monorepo runs

[betegon]

Running sentry init --yes --features errors against a monorepo would hit the select-target-app step, fail to resolve an app non-interactively, and send { cancelled: true } as resume data to the server. The server validated it against a schema requiring selectedApp and returned HTTP 500. Users saw:

WizardError: HTTP error! status: 500 - {"error":"Invalid resume data: \n- selectedApp: Required"}

Three root causes fixed here:

1. No non-interactive escape hatch. Added --app <name> flag so CI/agent runs can specify which monorepo app to initialize. Case-insensitive match against the server-provided app list.

2. handleSelect returned instead of throwing. When --yes was set with multiple apps, it returned { cancelled: true } which got forwarded to the server as resume data. It now throws with a formatted app list and the exact re-run command:

This monorepo has 3 apps. Use --app to specify which one to initialize:

  sentry init --yes --features <features> --app web

Available apps:
  web    (Next.js)   /repo/apps/web
  api    (Express)   /repo/apps/api
  admin  (React)     /repo/packages/admin

Or run without --yes to pick interactively:
  sentry init

3. Safety net. Added a guard in handleSuspendedStep that throws before any { cancelled: true } result can reach resumeWithRetry, so a future regression fails on the CLI side rather than producing an opaque server error.

Also fixed the default branch in handleInteractive (same { cancelled: true } bug for unknown prompt kinds) and rewrote formatAppList to iterate over items rather than apps so the list stays correct if payload.options and payload.apps ever arrive at different lengths.

Closes CLI-17A (77 events, all is_tty: False + flag.yes: True).

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Codecov Results 📊

✅ 6986 passed | Total: 6986 | Pass Rate: 100% | Execution Time: 0ms

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +6
Passed Tests	📈 +6
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 85.39%. Project has 14236 uncovered lines.
❌ Project coverage is 76.99%. Comparing base (base) to head (head).

Files with missing lines (2)

File	Patch %	Lines
src/lib/init/wizard-runner.ts	18.18%	⚠️ 9 Missing
src/lib/init/interactive.ts	94.20%	⚠️ 4 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    77.15%    76.99%    -0.16%
==========================================
  Files          320       320         —
  Lines        61662     61873      +211
  Branches         0         0         —
==========================================
+ Hits         47572     47637       +65
- Misses       14090     14236      +146
- Partials         0         0         —

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