fix(ci): retry alpha dist-tag verification on registry propagation delay

[mahyarmlk]

The repair workflow successfully set alpha dist-tags and pushed git tags, but failed because npm view immediately read stale dist-tag data. This patch adds retry polling to both alpha dist-tag verification steps so they wait for registry propagation before failing.

Changes:

• Both publish-alpha.yml and repair-alpha-metadata.yml now retry up to 25 times (~5 min at 10-15s sleep intervals)
• Uses --prefer-online flag with a fallback to plain npm view
• Prints package name, expected version, actual version, and attempt number
• Only fails after all retries are exhausted

Resolves the race where npm's CDN hasn't propagated the newly-set dist-tag.