Submit an existing pending PR review as a comment or request changes

Is your feature request related to a problem? Please describe.

A pending GitHub review can contain multiple unpublished inline comments. gh-dash currently has no native way to submit that existing review as either non-blocking feedback (COMMENT) or a request for required changes (REQUEST_CHANGES).

Describe the solution you'd like

When the current user has a pending review, provide an action that submits that specific review with either of these outcomes:

• Comment (COMMENT) — publish the review as non-blocking feedback
• Request changes (REQUEST_CHANGES) — publish the review with fix needed status

Describe alternatives you've considered

• Call GitHub's pending-review submission API directly using the review ID.
• Run gh pr review --comment or gh pr review --request-changes, accepting that these create a new submitted review instead of submitting the existing pending review.

Additional context

Related:

• https://github.com/dlvhdr/gh-dash/issues/490 broader request for drafting, editing, and submitting PR reviews
• https://github.com/dlvhdr/gh-dash/pull/399 implemented the existing v approval action and provides a precedent for native review actions.