fix(init): tighten feedback banner copy

[betegon]

Summary

Shortens the persistent init footer feedback prompt so it reads like a copyable command. The banner now uses $ sentry cli feedback "what worked or broke" and keeps padding on both edges of the purple footer.

Fix

Reserve a right-padding column when formatting the feedback banner, then update the footer copy to the shorter command-style text. The formatter is exported for a small regression test that checks the banner width and edge padding directly.

Test Plan

bun test test/lib/init/ui/ink-app.snapshot.test.tsx
bunx ultracite check src/lib/init/ui/ink-app.tsx test/lib/init/ui/ink-app.snapshot.test.tsx
bun run typecheck

[github-actions]

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[github-actions]

Codecov Results 📊

✅ 6836 passed | Total: 6836 | Pass Rate: 100% | Execution Time: 0ms

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +1
Passed Tests	📈 +1
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 13942 uncovered lines.
❌ Project coverage is 77%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    77.04%    77.00%    -0.04%
==========================================
  Files          317       317         —
  Lines        60594     60626       +32
  Branches         0         0         —
==========================================
+ Hits         46685     46684        -1
- Misses       13909     13942       +33
- Partials         0         0         —

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