fix(tui): narrow mention depth hint

crates/tui/src/tui/file_mention.rs

@@ -301,7 +301,7 @@ pub fn try_autocomplete_file_mention(app: &mut App) -> bool {
 }
 
 fn no_file_mention_matches_status(partial: &str, walk_depth: usize) -> String {
-    if walk_depth > 0 && (partial.contains('/') || partial.contains('\\')) {
+    if path_partial_reaches_walk_depth(partial, walk_depth) {
         format!(
             "No files match @{partial} (mention_walk_depth={walk_depth}; use /config set mention_walk_depth 0 to search deeper)"
         )
@@ -310,6 +310,17 @@ fn no_file_mention_matches_status(partial: &str, walk_depth: usize) -> String {
     }
 }
 
+fn path_partial_reaches_walk_depth(partial: &str, walk_depth: usize) -> bool {
+    if walk_depth == 0 {
+        return false;
+    }
+    let component_count = partial
+        .split(['/', '\\'])
+        .filter(|component| !component.is_empty())
+        .count();
+    component_count >= walk_depth
+}
+
 /// Splice a completion into the input, replacing the `@<partial>` token at
 /// `byte_start` with `@<replacement>`. Cursor moves to the end of the new
 /// token so further keystrokes extend (or escape via space) naturally.

crates/tui/src/tui/ui/tests.rs

@@ -4748,6 +4748,40 @@ fn try_autocomplete_file_mention_no_match_mentions_depth_cap_for_path_like_parti
     );
 }
 
+#[test]
+fn try_autocomplete_file_mention_no_match_skips_depth_hint_for_shallow_path() {
+    let tmpdir = TempDir::new().expect("tempdir");
+
+    let mut app = create_test_app();
+    app.workspace = tmpdir.path().to_path_buf();
+    app.mention_walk_depth = 6;
+    app.input = "@shallow_missing/main.rs".to_string();
+    app.cursor_position = app.input.chars().count();
+
+    assert!(try_autocomplete_file_mention(&mut app));
+    assert_eq!(
+        app.status_message.as_deref(),
+        Some("No files match @shallow_missing/main.rs")
+    );
+}
+
+#[test]
+fn try_autocomplete_file_mention_no_match_skips_depth_hint_when_unlimited() {
+    let tmpdir = TempDir::new().expect("tempdir");
+
+    let mut app = create_test_app();
+    app.workspace = tmpdir.path().to_path_buf();
+    app.mention_walk_depth = 0;
+    app.input = "@a/b/c/d/e/f/g/target".to_string();
+    app.cursor_position = app.input.chars().count();
+
+    assert!(try_autocomplete_file_mention(&mut app));
+    assert_eq!(
+        app.status_message.as_deref(),
+        Some("No files match @a/b/c/d/e/f/g/target")
+    );
+}
+
 #[test]
 fn try_autocomplete_file_mention_returns_false_outside_mention() {
     let mut app = create_test_app();