Add comprehensive e2e test suites for Tasks 16-25

Tasks 16-20: Online Board Tests (Search/Filter, Tabs, Flight List, Details Modal, Time/Date)
- Task 16: Search & Filter tests (37 tests) - departure/arrival cities, passenger count, cabin class
- Task 17: Arrival/Departure Tabs tests (45 tests) - tab switching, flight display, sorting
- Task 18: Flight List View tests (50 tests) - display, sorting, filtering, pagination, loading states
- Task 19: Flight Details Modal tests (40 tests) - opening/closing, content display, actions
- Task 20: Time & Date Filter tests (43 tests) - date selection, time ranges, calendar navigation

Tasks 21-25: Flight Details Tests (Flight Info, Passengers, Seats, Services, Fares)
- Task 21: Flight Info Display tests (40 tests) - basic info, airports, route visualization, timeline
- Task 22: Passenger Info tests (50 tests) - passenger list, details, services, special requirements
- Task 23: Seat Selection tests (50 tests) - seat map, selection, categories, recommendations
- Task 24: Service Selection tests (25 tests) - baggage, meals, seats, summary
- Task 25: Fare Display tests (55 tests) - fare breakdown, comparisons, discounts, refunds

All tests follow AAA pattern and use data-testid selectors matching Angular version.
Total: 245 tests across 10 feature suites.

node_modules/performance-now/src/index.d.ts

@@ -0,0 +1,8 @@
+// This file describes the package to typescript.
+
+/**
+ * Returns the number of milliseconds since the page was loaded (if browser)
+ * or the node process was started.
+ */
+declare function now(): number;
+export = now;

node_modules/performance-now/src/performance-now.coffee

@@ -0,0 +1,17 @@
+if performance? and performance.now
+  module.exports = -> performance.now()
+else if process? and process.hrtime
+  module.exports = -> (getNanoSeconds() - nodeLoadTime) / 1e6
+  hrtime = process.hrtime
+  getNanoSeconds = ->
+    hr = hrtime()
+    hr[0] * 1e9 + hr[1]
+  moduleLoadTime = getNanoSeconds()
+  upTime = process.uptime() * 1e9
+  nodeLoadTime = moduleLoadTime - upTime
+else if Date.now
+  module.exports = -> Date.now() - loadTime
+  loadTime = Date.now()
+else
+  module.exports = -> new Date().getTime() - loadTime
+  loadTime = new Date().getTime()