feat(tui): QA fixes + approval Ctrl keys, workflow focus, session UUID

- gate session-list nav on idle so in-session arrows/jk don't move the list (5a)
- approval dismiss on esc + in-session 'a' reopens a pending approval (5b)
- auto-focus a newly started workflow session (was running invisibly)
- approval actions on Ctrl chords (^a/^r/^x) matching the modal; bare/Alt letters no longer approve; diff closes on ^x/esc
- steer hint in the approval modal; session UUID in the input bar
- env-gated debug logging (CORREX_TUI_LOG) with k.Alt in the key trace

apps/tui-go/internal/app/overlays.go

@@ -88,7 +88,7 @@ func (m Model) renderApproval(base string) string {
 		b.WriteString(mbg(t, m.steerBuffer, t.P.FgStrong))
 	}
 	b.WriteString(lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("▏") + "\n\n")
-	b.WriteString(modalHints(t, [][2]string{{"^a", "approve"}, {"^r", "reject"}, {"enter", "approve"}, {"^x", "diff"}, {"esc", "later"}}))
+	b.WriteString(modalHints(t, [][2]string{{"^a", "approve"}, {"^r", "reject"}, {"s", "steer"}, {"enter", "approve"}, {"^x", "diff"}, {"esc", "later"}}))
 
 	modal := t.Overlay.Width(w).Render(b.String())
 	return m.center(modal)