tui: Tab cannot indent a multi-line Playbook selection — the selection menu claims the key

[edwin-zvs]

Spec 0094 gives Tab / S-Tab list nesting that "operate on every list line the selection spans, or just the cursor's line when there is no selection". The multi-line half is unreachable: a selection also shows the selection action menu, and that menu claims Tab first, to focus itself.

if !menu_focused {
    if matches!(key.code, KeyCode::Tab) && !ctrl && !alt && !super_mod {
        let menu = popup.selection_menu.get_or_insert_with(Default::default);
        menu.focused = true;
        return true;
    }
    return false;
}

(crates/cli/src/app/editor.rs ~lines 1100–1110 @ ad47152 — handle_playbook_selection_menu_key runs before the editor's own key match, so KeyCode::Tab => self.shift_playbook_indent(false) at ~line 811 never sees it.)

S-Tab is not intercepted, so it still outdents the selection. The pair is asymmetric: you can un-nest a multi-line selection but not nest it.

Repro

Document - one\n- two\n- three\n.

1. Put the caret at the start, press S-Down twice (selection (2, 14), menu appears).
2. Press Tab.

Observed: document unchanged; the selection menu takes focus.

after Tab with selection:   '- one\n- two\n- three\n'
after S-Tab with selection: '- one\n- two\n  - three\n'   ← outdent applied

Without a selection, Tab indents the caret's line correctly (- three → - three), so the binding works — it is only shadowed while a selection exists, which is exactly when multi-line nesting is wanted.

Expected

Indenting a selected block of list items should work from the keyboard. Options:

• give the menu a different focus key (it is only reachable by Tab today, and that is itself undiscoverable — see tui: playbook selection menu is shown but unfocused — Enter replaces the selection instead of running it #1092),
• or let Tab indent while the menu is merely shown, and reserve menu navigation for when it is focused.

Whichever is chosen, Tab and S-Tab should be symmetric.

Acceptance criteria

• Tab with a multi-line selection indents every list line the selection spans, per spec 0094.
• S-Tab keeps outdenting the same lines.
• The selection menu is still reachable from the keyboard, by a key that is advertised.

Found during a hands-on UX audit of the Playbook in the TUI and web UI.