refactor(issue,pr): trim help, restating comments and single-use helpers

Cut issue, pr, label, milestone and comment examples to at most three, drop
doc comments that only restate the name, fold the comment and attachment
argument lookups into one closure each, and inline label helpers with one
caller.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/discussion_view.go

@@ -37,12 +37,10 @@ type discussionComment struct {
 	meta                             [2]string
 }
 
-// stateBadge shows a discussion state, such as Open or Merged, in its color.
 func stateBadge(state string) terminal.Cell {
 	return terminal.Cell{Text: titleCase(state), Color: stateColors[state]}
 }
 
-// labelCells shows labels in their colors.
 func labelCells(labels []services.Label) []terminal.Cell {
 	cells := make([]terminal.Cell, len(labels))
 	for i, label := range labels {
@@ -151,7 +149,6 @@ func pullView(item services.Pull, repo string, details pullDetails) discussionVi
 	if checks != "" {
 		checksHint = fmt.Sprintf("%s (tea pr checks %d)", checks, item.Number)
 	}
-	reviews := details.reviews
 	return discussionView{
 		number: item.Number, comments: item.Comments, summary: summary,
 		view: terminal.View{
@@ -176,7 +173,7 @@ func pullView(item services.Pull, repo string, details pullDetails) discussionVi
 			}
 		},
 		extraComments: func(cmd *cobra.Command, t target, n int64) ([]discussionComment, error) {
-			return pullReviewComments(cmd, t, n, reviews)
+			return pullReviewComments(cmd, t, n, details.reviews)
 		},
 	}
 }