chore: prepare v6.4.12 playback reporting release

[chrisae9]

Summary

Prepare v6.4.12 with the playback reporting fix merged in #116. Update package and lockfile versions together. Publishing the release is authorized; production deployment remains held until all movie and episode sessions have finished.

Verification

• Version-only change; package and lockfile both report 6.4.12.
• fix: keep room playback reporting independent of subtitles #116 passed 171 Node tests, 584 frontend tests, lint, build, and all required CI checks.
• Required CI will run again before merge.

Checklist

• The change is focused and targets dev.
• Behavior changes include regression coverage.
• Documentation or release notes were updated when needed.
• Security-sensitive changes were reviewed for unsafe inputs, secrets, and permissions.
• All actionable CodeRabbit findings are fixed or answered with rationale.

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📥 Commits

Reviewing files that changed from the base of the PR and between b29c16b and 4e26866.

⛔ Files ignored due to path filters: 1

• package-lock.json is excluded by !**/package-lock.json, !package-lock.json

📒 Files selected for processing: 1

• package.json

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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