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/app.go

@@ -14,6 +14,7 @@ import (
 	"regexp"
 	"slices"
 	"strings"
+	"sync"
 	"time"
 	"unicode"
 
@@ -71,6 +72,27 @@ type options struct {
 type application struct {
 	deps    Dependencies
 	options options
+
+	// snapshot caches the settings for one run; generation is the store's generation it was loaded at.
+	mu         sync.Mutex
+	snapshot   *settings.Snapshot
+	generation uint64
+}
+
+// settings returns the settings, loaded once per run and again after tea changed them.
+func (a *application) settings() (settings.Snapshot, error) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	generation := a.deps.Settings.Generation()
+	if a.snapshot != nil && a.generation == generation {
+		return *a.snapshot, nil
+	}
+	snapshot, err := a.deps.Settings.Load()
+	if err != nil {
+		return snapshot, err
+	}
+	a.snapshot, a.generation = &snapshot, generation
+	return snapshot, nil
 }
 
 // NewRoot builds fresh commands. Construction performs no disk, network, or Git IO.
@@ -144,7 +166,7 @@ func NewRoot(deps Dependencies) *cobra.Command {
 		if offline(cmd) {
 			return nil
 		}
-		snapshot, err := a.deps.Settings.Load()
+		snapshot, err := a.settings()
 		if err != nil {
 			return err
 		}