test: replace Date.now() with fixed timestamps in tests

Addresses flaky test detection bot J7 pattern (non-deterministic data).

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: sahar-fehri

app/components/UI/AssetOverview/PriceChart/PriceChart.test.tsx

@@ -258,8 +258,10 @@ describe('PriceChart', () => {
      * Synthetic responder event with the touchHistory shape
      * that PanResponder's internal state machine expects.
      */
+    const FIXED_TIMESTAMP = 1_736_761_237_983;
+
     const createResponderEvent = (locationX: number, locationY: number) => {
-      const timestamp = Date.now();
+      const timestamp = FIXED_TIMESTAMP;
       return {
         nativeEvent: {
           locationX,

app/components/hooks/useTokenHistoricalPrices.test.ts

@@ -18,7 +18,7 @@ function makeTimeSeries(
 }
 
 describe('hasInsufficientTimeCoverage', () => {
-  const now = Date.now();
+  const now = 1_000_000_000_000;
 
   it('returns false for "all" time period (no expected duration)', () => {
     const prices = makeTimeSeries(now, 10, HOUR_MS);