diff --git a/examples/ai-streaming/src/index.tsx b/examples/ai-streaming/src/index.tsx
index c172a666d..e8c98f0b3 100644
--- a/examples/ai-streaming/src/index.tsx
+++ b/examples/ai-streaming/src/index.tsx
@@ -40,7 +40,7 @@ class AIStreamingApp extends Widget {
         this.addChild(this._toolCall);
         this.addChild(this._streamingText);
 
-        setInterval(() => {
+        clearInterval(window.__interval); window.__interval = setInterval(() => {
             this._streamingText.tick();
         }, 50);
     }
diff --git a/examples/showcase/src/index.tsx b/examples/showcase/src/index.tsx
index 444be6698..47a52a3e3 100644
--- a/examples/showcase/src/index.tsx
+++ b/examples/showcase/src/index.tsx
@@ -128,7 +128,7 @@ class ShowcaseApp extends Widget {
         if (event.key === 'q' || (event.ctrl && event.key === 'c')) return false;
 
         // Tab switching: 1-5
-        const num = parseInt(event.key);
+        const num = parseInt(event.key, 10);
         if (num >= 1 && num <= 5) {
             this.switchTab(num - 1);
             return true;
diff --git a/packages/dev-server/src/devtools.ts b/packages/dev-server/src/devtools.ts
index 17222d074..c820a8b76 100644
--- a/packages/dev-server/src/devtools.ts
+++ b/packages/dev-server/src/devtools.ts
@@ -98,7 +98,7 @@ export class DevTools {
     captureFrame(): string {
         if (this._frameRows.length === 0) return '';
         let endIndex = this._frameRows.length;
-        while (endIndex > 0 && this._frameRows[endIndex - 1].trim() === '') {
+        while (endIndex > 0 && this._frameRows[endIndex - 1].trim().length === 0) {
             endIndex--;
         }
         const trimmedRows = this._frameRows.slice(0, endIndex);
diff --git a/packages/ui/src/MultiSelect.ts b/packages/ui/src/MultiSelect.ts
index b4116418f..327e1eee2 100644
--- a/packages/ui/src/MultiSelect.ts
+++ b/packages/ui/src/MultiSelect.ts
@@ -30,7 +30,7 @@ export class MultiSelect extends Widget {
     }
 
     get selectedOptions(): MultiSelectOption[] {
-        return [...this._checked].sort().map(i => this._options[i]);
+        return [...this._checked].sort((a, b) => a - b).map(i => this._options[i]);
     }
     selectNext(): void { if (this._options.length === 0) return; let n = this._cursorIndex + 1; while (n < this._options.length && this._options[n].disabled) n++; if (n < this._options.length) { this._cursorIndex = n; this.markDirty(); } }
     selectPrev(): void { if (this._options.length === 0) return; let n = this._cursorIndex - 1; while (n >= 0 && this._options[n].disabled) n--; if (n >= 0) { this._cursorIndex = n; this.markDirty(); } }