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feat: add lazy-loaded PR comment count component (#290)

* feat: add lazy-loaded PR comment count component

Introduce a new `CommentCount` component that provides a more accurate
total of comments by including review comments and the PR body.

- Use `useInView` to trigger data fetching only when the item enters the
  viewport.
- Calculate total count by summing `comments`, `review_comments`, and
  the PR description.
- Replace the static comment count in `PullRequestListItem` with this
  dynamic component.

```mermaid
sequenceDiagram
    participant List as PullRequestListItem
    participant CC as CommentCount
    participant Hook as usePullRequestDetail
    participant API as GitHub API

    List->>CC: Mounts with PR details
    CC->>CC: Monitor visibility (useInView)
    Note over CC: User scrolls to item
    CC->>Hook: Set isActive to true
    Hook->>API: Fetch full PR details
    API-->>Hook: Return comments & reviews
    Hook-->>CC: Update data
    CC->>List: Render total comment count
```

* Update src/components/CommentCount.tsx

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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