feat: l goes to the details of what's selected; enter still drills in

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

internal/ui/app/app.go

@@ -821,6 +821,8 @@ func (m *Model) handleKey(msg tea.KeyPressMsg) (cmd tea.Cmd, quit bool) {
 		if r, ok := m.sources.Selected(); ok && m.focus == paneContainers && r.kind == rowGroup {
 			m.focus = paneDetail // an account's row: nothing between
 		}
+	case key.Matches(msg, k.Details):
+		m.focus = paneDetail // what's selected, on the right
 	case key.Matches(msg, k.PrevPane):
 		if m.focus == paneDetail {
 			m.focus = m.lastLeft // back to what it describes

internal/ui/app/app_test.go

@@ -758,7 +758,9 @@ func TestFocusKeys(t *testing.T) {
 	}{
 		{"tab", paneContainers}, {"enter", paneSecrets}, {"enter", paneDetail},
 		{"enter", paneDetail}, {"esc", paneSecrets}, {"shift+tab", paneContainers},
-		{"4", paneDetail}, {"l", paneSources}, {"h", paneDetail},
+		{"4", paneDetail}, {"tab", paneSources}, {"shift+tab", paneDetail},
+		// l: what's selected, on the right; h: back to it.
+		{"2", paneContainers}, {"l", paneDetail}, {"h", paneContainers}, {"h", paneSources}, {"l", paneDetail},
 	} {
 		d.keys(tc.key)
 		if d.m.focus != tc.want {