feat: display recent datapoints in view and review commands

[Copilot]

The buzz view and buzz review commands now display up to 5 most recent datapoints for each goal, showing date, value, and comment.

Changes

• formatRecentDatapoints(): New function formats datapoints with date (YYYY-MM-DD), value, and optional comment
• formatGoalDetails(): Appends datapoint section when available
• FetchGoalsWithDatapoints(): New function fetches all goals with datapoints using worker pool (max 5 concurrent)
• handleViewCommand(): Changed to fetch datapoints via FetchGoalWithDatapoints()
• handleReviewCommand(): Changed to fetch all goals with datapoints via FetchGoalsWithDatapoints()

Example Output

Goal: mygoal
Title:       My Test Goal
Limsum:      +2 in 3 days
...

Recent datapoints:
  2024-12-13: 10 (Added via buzz)
  2024-12-14: 15.5 (Good progress)
  2024-12-15: 8
  2024-12-16: 12 (Almost there)
  2024-12-17: 20 (Done for today)

The concurrent fetching approach handles N+1 queries efficiently for users with many goals. Fetch errors for individual goals don't block the entire operation.

Original prompt

Let's display recent datapoints when viewing a goal using buzz view and buzz review

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