Add delay countdown UI progress

Introduce visible countdown indicators for rate-limit delays between tests:
- Extend test runner to emit and expose delay progress updates.
- Update IntegrationTestRunner UI to display countdown while pausing.
- Ensure users see why tests are paused during delays.

src/lib/integrationTests/testRunner.ts

@@ -143,7 +143,38 @@ export class IntegrationTestRunner {
 
       // Add delay between tests to prevent rate limiting (except after the last test)
       if (i < suite.tests.length - 1 && this.delayBetweenTests > 0) {
+        // Report delay status with countdown
+        const delaySeconds = this.delayBetweenTests / 1000;
+        const delayResult: TestResult = {
+          id: `delay-${Date.now()}`,
+          name: `⏳ Rate limit delay: ${delaySeconds}s`,
+          suite: suite.name,
+          status: 'running',
+          duration: 0,
+          timestamp: new Date().toISOString(),
+          details: { 
+            reason: 'Pausing to prevent rate limiting',
+            delayMs: this.delayBetweenTests
+          }
+        };
+        
+        if (this.onProgress) {
+          this.onProgress(delayResult);
+        }
+
         await this.delay(this.delayBetweenTests);
+
+        // Mark delay as complete
+        const delayCompleteResult: TestResult = {
+          ...delayResult,
+          status: 'skip',
+          duration: this.delayBetweenTests,
+          details: { reason: 'Rate limit delay completed' }
+        };
+        
+        if (this.onProgress) {
+          this.onProgress(delayCompleteResult);
+        }
       }
     }