perf(e2e): optimize polling intervals in helpers

Phase 1.4 of E2E test optimization:
- TASK_POLL_INTERVAL: 300ms → 150ms
- waitForSyncComplete() stable check: 300ms → 150ms
- waitForSyncComplete() spinner check: 200ms → 100ms
- Dialog loop polling: 200ms → 100ms

Expected impact: 5-10s saved per test (faster detection)
Risk: Low - still reasonable for network operations

e2e/pages/supersync.page.ts

@@ -473,7 +473,7 @@ export class SuperSyncPage extends BasePage {
             await this.conflictApplyBtn.click();
             break;
           }
-          await this.page.waitForTimeout(200);
+          await this.page.waitForTimeout(100); // Reduced from 200ms
         }
 
         // Wait for dialog to close
@@ -558,13 +558,13 @@ export class SuperSyncPage extends BasePage {
           return;
         }
 
-        await this.page.waitForTimeout(300);
+        await this.page.waitForTimeout(150); // Reduced from 300ms
         continue;
       }
 
       // Still spinning - reset stable count
       stableCount = 0;
-      await this.page.waitForTimeout(200);
+      await this.page.waitForTimeout(100); // Reduced from 200ms
     }
 
     throw new Error(`Sync did not complete within ${timeout}ms`);

e2e/utils/e2e-constants.ts

@@ -70,8 +70,8 @@ export const RETRY_BASE_DELAY = 1000;
 /** Delay after sync to allow UI to update */
 export const POST_SYNC_UI_SETTLE = 1000;
 
-/** Polling interval for waiting for tasks */
-export const TASK_POLL_INTERVAL = 300;
+/** Polling interval for waiting for tasks (reduced from 300ms) */
+export const TASK_POLL_INTERVAL = 150;
 
 /** Default timeout for waiting for a task to appear */
 export const TASK_WAIT_TIMEOUT = 30000;