Add Vim search motions to the composer (#41586)

## What changed

- Add draft-local forward and backward literal search with `/` and `?`, plus
  wrapped repeat navigation with `n` and `N`.
- Support search motions after delete, change, and yank operators, while keeping
  queries separate from the draft and skipping atomic elements and partial
  grapheme matches.
- Render and edit the query in the composer footer, highlight matches, and add
  configurable `tui.keymap.vim_search` bindings to the keymap picker and schema.

## Testing

- Cover navigation, wrapping, operator composition, repeat behavior, Unicode
  graphemes, atomic elements, query editing, paste handling, and rendering.

GitOrigin-RevId: 087b080ff8fd74e48456c6b899c07ea5eed38e0c

codex-rs/config/src/tui_keymap.rs

@@ -324,6 +324,21 @@ pub struct TuiVimOperatorKeymap {
     pub cancel: Option<KeybindingsSpec>,
 }
 
+/// Search motions shared by Vim normal and operator-pending input.
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, Default, JsonSchema)]
+#[serde(deny_unknown_fields)]
+#[schemars(deny_unknown_fields)]
+pub struct TuiVimSearchKeymap {
+    /// Search forward in the active buffer (`/`).
+    pub forward: Option<KeybindingsSpec>,
+    /// Search backward in the active buffer (`?`).
+    pub backward: Option<KeybindingsSpec>,
+    /// Repeat the accepted search (`n`).
+    pub next: Option<KeybindingsSpec>,
+    /// Repeat in the opposite direction (`N`).
+    pub previous: Option<KeybindingsSpec>,
+}
+
 /// Vim text-object keybindings for modal editing inside text areas.
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, Default, JsonSchema)]
 #[serde(deny_unknown_fields)]
@@ -470,6 +485,8 @@ pub struct TuiKeymap {
     #[serde(default)]
     pub vim_operator: TuiVimOperatorKeymap,
     #[serde(default)]
+    pub vim_search: TuiVimSearchKeymap,
+    #[serde(default)]
     pub vim_text_object: TuiVimTextObjectKeymap,
     #[serde(default)]
     pub pager: TuiPagerKeymap,

codex-rs/config/src/types.rs

@@ -42,6 +42,7 @@ pub use crate::tui_keymap::TuiListKeymap;
 pub use crate::tui_keymap::TuiPagerKeymap;
 pub use crate::tui_keymap::TuiVimNormalKeymap;
 pub use crate::tui_keymap::TuiVimOperatorKeymap;
+pub use crate::tui_keymap::TuiVimSearchKeymap;
 
 pub const DEFAULT_OTEL_ENVIRONMENT: &str = "dev";
 pub const DEFAULT_MEMORIES_MAX_ROLLOUTS_PER_STARTUP: usize = 2;