refactor: load settings once per run and reuse shared helpers

The application caches the settings snapshot and reloads it only after
an update through the store, so output and prompt helpers no longer
read and parse config.yml and hosts.yml several times per command.
canPrompt and chooser replace the inline prompt-policy checks.

Checks are tallied by one services.Tally, terminal.Plural replaces the
two app copies, refKind.article/noun replace the comment group's own
words, list commands use servicePage, and web URLs are built by
repositoryURL and webURL in browser.go.

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

internal/app/pulls.go

@@ -109,7 +109,7 @@ each pull request, which tea only makes when --json names them.`, Args: argsExac
 				}
 			},
 			Empty: empty, Context: what,
-		}, listPage{Number: page, More: window.More, Total: window.Total, Counted: window.Counted})
+		}, servicePage(window, page))
 	}}
 	enumFlag(cmd, &state, "state", "s", "open", "Filter by state", "open", "closed", "merged", "all")
 	pageFlags(cmd, &limit, &page)
@@ -163,11 +163,6 @@ func (a *application) jsonSelects(fields ...string) bool {
 	return false
 }
 
-// repositoryURL returns the web URL of the target's repository.
-func repositoryURL(t target) string {
-	return strings.TrimSuffix(t.Host, "/") + "/" + t.Repo
-}
-
 // milestoneFilter resolves a milestone given as an ID or a title (D10): a number is an ID first,
 // then a title.
 func milestoneFilter(ctx context.Context, t target, raw string) (int64, error) {