diff --git a/crates/kebab-tui/src/library.rs b/crates/kebab-tui/src/library.rs
index 5ce1d6c..d46165d 100644
--- a/crates/kebab-tui/src/library.rs
+++ b/crates/kebab-tui/src/library.rs
@@ -127,6 +127,13 @@ fn filter_overlay_height(state: &App) -> u16 {
     }
 }
 
+/// Single source of truth for the filter overlay row labels — used
+/// both by `line_with_focus` (display) and the cursor-placement
+/// `display_width(...)` math below. Editing one without the other
+/// would silently miscolumn the caret.
+const LABEL_TAGS: &str = "tags_any (csv): ";
+const LABEL_LANG: &str = "lang:           ";
+
 fn render_filter_overlay(f: &mut Frame, area: Rect, edit: &FilterEdit, theme: &crate::theme::Theme) {
     let block = Block::default()
         .title("Filter (Tab=cycle field, Enter=apply, Esc=cancel)")
@@ -135,8 +142,8 @@ fn render_filter_overlay(f: &mut Frame, area: Rect, edit: &FilterEdit, theme: &c
     f.render_widget(block, area);
 
     let lines = vec![
-        line_with_focus("tags_any (csv): ", edit.tags_buf.as_str(), edit.field == FilterField::Tags, theme),
-        line_with_focus("lang:           ", edit.lang_buf.as_str(), edit.field == FilterField::Lang, theme),
+        line_with_focus(LABEL_TAGS, edit.tags_buf.as_str(), edit.field == FilterField::Tags, theme),
+        line_with_focus(LABEL_LANG, edit.lang_buf.as_str(), edit.field == FilterField::Lang, theme),
     ];
     let para = Paragraph::new(lines);
     f.render_widget(para, inner);
@@ -146,18 +153,11 @@ fn render_filter_overlay(f: &mut Frame, area: Rect, edit: &FilterEdit, theme: &c
     // omits set_cursor_position (Library/Inspect main view), ratatui
     // calls hide_cursor instead. So this single call positions the
     // caret on the focused field of the filter overlay.
-    let (label_w, focused_buf, row_offset) = match edit.field {
-        FilterField::Tags => (
-            display_width("tags_any (csv): ") as u16,
-            &edit.tags_buf,
-            0u16,
-        ),
-        FilterField::Lang => (
-            display_width("lang:           ") as u16,
-            &edit.lang_buf,
-            1u16,
-        ),
+    let (label, focused_buf, row_offset) = match edit.field {
+        FilterField::Tags => (LABEL_TAGS, &edit.tags_buf, 0u16),
+        FilterField::Lang => (LABEL_LANG, &edit.lang_buf, 1u16),
     };
+    let label_w = display_width(label) as u16;
     let raw_x = inner.x + label_w + focused_buf.cursor_col() as u16;
     let cursor_x = raw_x.min(inner.x + inner.width.saturating_sub(1));
     f.set_cursor_position((cursor_x, inner.y + row_offset));