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## Why Picker-style UI in the TUI has accumulated a mix of hardcoded navigation keys. Some lists supported page movement, some did not; some accepted Vim-like keys, while others only accepted arrows; and tabbed or horizontally adjustable pickers had no shared keymap action for left/right movement. This PR makes picker/list navigation consistent and configurable so users can rely on the same defaults across the TUI. ## What Changed - Adds shared list keymap actions for: - vertical movement: `move_up`, `move_down` - horizontal movement: `move_left`, `move_right` - paging and jumps: `page_up`, `page_down`, `jump_top`, `jump_bottom` - Adds defaults: - Up/down: arrows, `Ctrl+P/N`, `Ctrl+K/J`, and plain `k/j` where text input is not active - Page up/down: `PageUp/PageDown` and `Ctrl+B/F` - First/last: `Home/End` - Left/right: `Left/Right` and `Ctrl+H/L` - Wires the shared list keymap through picker and list surfaces including session resume, multi-select, tabbed selection lists, settings-style lists, app-link selection, MCP elicitation, request-user-input, and the OSS selection wizard. - Keeps search behavior intact by reserving printable characters for query text in searchable pickers. - Updates keymap setup actions, config schema, snapshots, and focused coverage for the new list actions. ## How to Test 1. Start Codex from this branch and open the session picker, for example with an existing session history. 2. In the session list, verify that `Ctrl+J/K` moves the selection down/up. 3. Verify that `Ctrl+F/B` pages down/up and `Home/End` jumps to the first/last visible session. 4. Type printable search text such as `j` or `k` and confirm it updates the query instead of navigating. 5. Focus a picker control that changes values horizontally, such as a session picker toolbar control, and verify `Ctrl+H/L` changes the focused value like left/right arrows. Targeted tests run: - `cargo test -p codex-tui keymap::tests::` - `cargo test -p codex-tui keymap_setup::tests::` - `cargo test -p codex-tui horizontal_list_keys` - `cargo test -p codex-tui page_and_jump_navigation_use_list_keymap` - `cargo test -p codex-tui ctrl_h_l_move_provider_selection` - `cargo test -p codex-tui scroll_state::tests` - `cargo test -p codex-tui switching_tabs_changes_visible_items_and_clears_search` - `cargo test -p codex-tui toggle_sort_key_reloads_with_new_sort` Also ran `just write-config-schema`, `just fmt`, `just fix -p codex-tui`, `just argument-comment-lint`, and `git diff --check`. Note: `cargo test -p codex-tui` was attempted and still aborts in the pre-existing `tests::fork_last_filters_latest_session_by_cwd_unless_show_all` stack overflow, which is unrelated to this branch.