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/backstopjs/cli/index.js

@@ -0,0 +1,49 @@
+#!/usr/bin/env node
+
+const parseArgs = require('minimist');
+const usage = require('./usage');
+const version = require('../package.json').version;
+const runner = require('../core/runner');
+
+main();
+
+function main () {
+  const argsOptions = parseArgs(process.argv.slice(2), {
+    boolean: ['h', 'help', 'v', 'version', 'i', 'docker'],
+    string: ['config'],
+    default: {
+      config: 'backstop.json'
+    }
+  });
+
+  // Catch errors from failing promises
+  process.on('unhandledRejection', function (error) {
+    console.error(error && error.stack);
+  });
+
+  if (argsOptions.h || argsOptions.help) {
+    console.log(usage);
+    return;
+  }
+
+  if (argsOptions.v || argsOptions.version) {
+    console.log('BackstopJS v' + version);
+    return;
+  }
+
+  const commandName = argsOptions._[0];
+
+  if (!commandName) {
+    console.log(usage);
+  } else {
+    console.log('BackstopJS v' + version);
+    runner(commandName, argsOptions).catch(function () {
+      process.exitCode = 1;
+    });
+
+    process.on('uncaughtException', function (err) {
+      console.log('Uncaught exception:', err.message, err.stack);
+      throw err;
+    });
+  }
+}

node_modules/backstopjs/cli/usage.js

@@ -0,0 +1,53 @@
+const version = require('../package.json').version;
+const makeSpaces = require('../core/util/makeSpaces');
+
+const commandsDescription = {
+  test: 'Create test screenshots and compare against the set you previously approved/referenced.',
+  approve: 'Promotes all test bitmaps from last test run to reference bitmaps.',
+  reference: 'Creates new reference screenshots. Deletes all existing reference files.',
+  init: 'Generate BackstopJS boilerplate files in your CWD. NOTE: Overwrites existing config files!',
+  remote: 'Launch BackstopJS remote service.',
+  openReport: 'View the last test report in your browser.'
+};
+
+const optionsDescription = {
+  '--config': 'Path to config file name',
+  '--filter': 'A RegEx string used to filter by scenario labels when running "test", "reference", or "approve" commands',
+  '-h, --help': 'Display usage',
+  '-v, --version': 'Display version',
+  '-i': 'Prevent deletion of non-matching reference files when running "reference" command (newer matching reference files are still overwritten)'
+};
+
+function makeDescription (descriptions) {
+  return Object.keys(descriptions)
+    .map(function (commandName) {
+      return makeSpaces(4) + commandName + spacesBetweenCommandAndDescription(commandName) + descriptions[commandName];
+    })
+    .join('\n');
+}
+
+// Number of spaces to echo before writing description
+const leftPaddingOfDescription = Object.keys(commandsDescription)
+  .concat(Object.keys(optionsDescription))
+  .map(function (string) {
+    return string.length;
+  })
+  .reduce(function maxReducer (max, length) {
+    return Math.max(max, length);
+  }, 0);
+
+function spacesBetweenCommandAndDescription (commandName) {
+  return makeSpaces(2 + leftPaddingOfDescription - commandName.length);
+}
+
+const usage = '\
+Welcome to BackstopJS ' + version + ' CLI\n\
+\n\
+Commands:\n\
+' + makeDescription(commandsDescription) + '\n\
+\n\
+Options:\n\
+' + makeDescription(optionsDescription) + '\n\
+\n';
+
+module.exports = usage;