TUI: guard against overflow width crashes (#1686)

Co-authored-by: Mohammad Jafari <mossein@users.noreply.github.com>

CHANGELOG.md

@@ -19,6 +19,7 @@ Status: unreleased.
 - Telegram: avoid block replies when streaming is disabled. (#1885) Thanks @ivancasco.
 - Auth: show copyable Google auth URL after ASCII prompt. (#1787) Thanks @robbyczgw-cla.
 - Routing: precompile session key regexes. (#1697) Thanks @Ray0907.
+- TUI: avoid width overflow when rendering selection lists. (#1686) Thanks @mossein.
 
 ## 2026.1.24-3
 

src/tui/components/filterable-select-list.ts

@@ -69,7 +69,7 @@ export class FilterableSelectList implements Component {
     lines.push(filterLabel + inputText);
 
     // Separator
-    lines.push(chalk.dim("─".repeat(width)));
+    lines.push(chalk.dim("─".repeat(Math.max(0, width))));
 
     // Select list
     const listLines = this.selectList.render(width);

src/tui/components/searchable-select-list.ts

@@ -214,7 +214,8 @@ export class SearchableSelectList implements Component {
       const maxValueWidth = Math.min(30, width - prefixWidth - 4);
       const truncatedValue = truncateToWidth(displayValue, maxValueWidth, "");
       const valueText = this.highlightMatch(truncatedValue, query);
-      const spacing = " ".repeat(Math.max(1, 32 - visibleWidth(valueText)));
+      const spacingWidth = Math.max(1, 32 - visibleWidth(valueText));
+      const spacing = " ".repeat(spacingWidth);
       const descriptionStart = prefixWidth + visibleWidth(valueText) + spacing.length;
       const remainingWidth = width - descriptionStart - 2;
       if (remainingWidth > 10) {