Description

bkt pr comments currently shows only ID, author, and truncated text. This PR adds:

• File path and line number for inline comments
• Resolved status for comment threads
• Task vs Comment distinction (severity BLOCKER = task)
• Task completion status
• Nested reply threads (replies are silently dropped)

Proposed solution

• Add --details flag for verbose multi-line output per comment
• Distinguish "Comment" vs "Task" in the header
• Use "Resolved: yes" for comment threads, "Complete: yes/no" for tasks (matching Bitbucket's own terminology)
• Flatten nested comment replies with depth-based indentation
• Show indented replies in default (non-details) mode too

Depends on #107 (activities endpoint fix).

Note: overlap between pr comments and pr task

bkt pr task list returns 404 on some DC instances — the /tasks endpoint doesn't exist there. Tasks are only surfaced as comments with severity: "BLOCKER" via the /activities endpoint.

This creates some overlap between pr comments --details and pr task list, since both can show tasks. However, pr comments --details serves a different use case: seeing all open items (comments and tasks) in one view, which is what a reviewee typically needs when working through a PR.