feat: show who an Azure account signs in as, in Details on its row

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/app/app_test.go

@@ -1069,3 +1069,33 @@ func lastLines(scr string, n int) string {
 	lines := strings.Split(strings.TrimRight(scr, "\n"), "\n")
 	return strings.Join(lines[max(0, len(lines)-n):], "\n")
 }
+
+// described is an account that can say who it is.
+type described struct{ provider.Provider }
+
+func (described) Account() (provider.Account, bool) {
+	return provider.Account{
+		Fields: []provider.Attr{{Label: "name", Value: "Alice Example"}, {Label: "object ID", Value: "oid-123"}},
+		Copy:   "oid-123", CopyLabel: "object ID",
+	}, true
+}
+
+func TestAccountInDetails(t *testing.T) {
+	t.Parallel()
+	d := newDriver(t, described{fake.Azure(0)})
+	d.keys("g") // the group's row
+	if r, _ := d.m.sources.Selected(); r.kind != rowGroup {
+		t.Fatalf("not on the group: %+v", r)
+	}
+	if scr := d.screen(); !strings.Contains(scr, "Alice Example") || !strings.Contains(scr, "oid-123") {
+		t.Errorf("account not in Details:\n%s", scr)
+	}
+	d.keys("y")
+	if got := d.clip().content; got != "oid-123" {
+		t.Errorf("y copied %q", got)
+	}
+	d.keys("j")
+	if strings.Contains(d.screen(), "Alice Example") {
+		t.Errorf("still shown on a subscription:\n%s", d.screen())
+	}
+}