fix: improve interactive CLI validation and recovery

[rmanibus]

Summary

• validate interactive profile, auth, store, and source inputs at prompt time
• add store verification recovery options, including AWS SSO login retries
• cover the new prompt validation and recovery helpers with tests

Closes #169

[codecov]

Codecov Report

❌ Patch coverage is 33.58209% with 89 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cmd/cloudstic/cmd_store.go	39.74%	47 Missing ⚠️
cmd/cloudstic/cmd_profile.go	7.14%	25 Missing and 1 partial ⚠️
cmd/cloudstic/runner.go	38.46%	8 Missing ⚠️
cmd/cloudstic/cmd_auth.go	0.00%	4 Missing ⚠️
cmd/cloudstic/interactive.go	63.63%	2 Missing and 2 partials ⚠️

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