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/tree-kill/LICENSE

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+MIT License
+
+Copyright (c) 2018 Peter Krumins
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

node_modules/tree-kill/README.md

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+Tree Kill
+=========
+
+Kill all processes in the process tree, including the root process.
+
+Examples
+=======
+
+Kill all the descendent processes of the process with pid `1`, including the process with pid `1` itself:
+```js
+var kill = require('tree-kill');
+kill(1);
+```
+
+Send a signal other than SIGTERM.:
+```js
+var kill = require('tree-kill');
+kill(1, 'SIGKILL');
+```
+
+Run a callback when done killing the processes. Passes an error argument if there was an error.
+```js
+var kill = require('tree-kill');
+kill(1, 'SIGKILL', function(err) {
+    // Do things
+});
+```
+
+You can also install tree-kill globally and use it as a command:
+```sh
+tree-kill 1          # sends SIGTERM to process 1 and its descendents
+tree-kill 1 SIGTERM  # same
+tree-kill 1 SIGKILL  # sends KILL instead of TERMINATE
+```
+
+Methods
+=======
+
+## require('tree-kill')(pid, [signal], [callback]);
+
+Sends signal `signal` to all children processes of the process with pid `pid`, including `pid`. Signal defaults to `SIGTERM`.
+
+For Linux, this uses `ps -o pid --no-headers --ppid PID` to find the parent pids of `PID`.
+
+For Darwin/OSX, this uses `pgrep -P PID` to find the parent pids of `PID`.
+
+For Windows, this uses `'taskkill /pid PID /T /F'` to kill the process tree. Note that on Windows, sending the different kinds of POSIX signals is not possible.
+
+Install
+=======
+
+With [npm](https://npmjs.org) do:
+
+```
+npm install tree-kill
+```
+
+License
+=======
+
+MIT
+
+Changelog
+=========
+
+
+## [1.2.2] - 2019-12-11
+### Changed
+- security fix: sanitize `pid` parameter to fix arbitrary code execution vulnerability
+
+## [1.2.1] - 2018-11-05
+### Changed
+- added missing LICENSE file
+- updated TypeScript definitions
+
+## [1.2.0] - 2017-09-19
+### Added
+- TypeScript definitions
+### Changed
+- `kill(pid, callback)` works. Before you had to use `kill(pid, signal, callback)`
+
+## [1.1.0] - 2016-05-13
+### Added
+- A `tree-kill` CLI
+
+## [1.0.0] - 2015-09-17
+### Added
+- optional callback
+- Darwin support

node_modules/tree-kill/cli.js

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+#!/usr/bin/env node
+kill = require('.')
+try {
+  kill(process.argv[2], process.argv[3], function(err){
+    if (err) {
+      console.log(err.message)
+      process.exit(1)
+    }
+  })
+}
+catch (err) {
+  console.log(err.message)
+  process.exit(1)
+}

node_modules/tree-kill/index.d.ts

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+/**
+ * Kills process identified by `pid` and all its children
+ *
+ * @param pid
+ * @param signal 'SIGTERM' by default
+ * @param callback
+ */
+declare function treeKill(pid: number, callback?: (error?: Error) => void): void;
+declare function treeKill(pid: number, signal?: string | number, callback?: (error?: Error) => void): void;
+
+declare namespace treeKill {}
+
+export = treeKill;

node_modules/tree-kill/index.js

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+'use strict';
+
+var childProcess = require('child_process');
+var spawn = childProcess.spawn;
+var exec = childProcess.exec;
+
+module.exports = function (pid, signal, callback) {
+    if (typeof signal === 'function' && callback === undefined) {
+        callback = signal;
+        signal = undefined;
+    }
+
+    pid = parseInt(pid);
+    if (Number.isNaN(pid)) {
+        if (callback) {
+            return callback(new Error("pid must be a number"));
+        } else {
+            throw new Error("pid must be a number");
+        }
+    }
+
+    var tree = {};
+    var pidsToProcess = {};
+    tree[pid] = [];
+    pidsToProcess[pid] = 1;
+
+    switch (process.platform) {
+    case 'win32':
+        exec('taskkill /pid ' + pid + ' /T /F', callback);
+        break;
+    case 'darwin':
+        buildProcessTree(pid, tree, pidsToProcess, function (parentPid) {
+          return spawn('pgrep', ['-P', parentPid]);
+        }, function () {
+            killAll(tree, signal, callback);
+        });
+        break;
+    // case 'sunos':
+    //     buildProcessTreeSunOS(pid, tree, pidsToProcess, function () {
+    //         killAll(tree, signal, callback);
+    //     });
+    //     break;
+    default: // Linux
+        buildProcessTree(pid, tree, pidsToProcess, function (parentPid) {
+          return spawn('ps', ['-o', 'pid', '--no-headers', '--ppid', parentPid]);
+        }, function () {
+            killAll(tree, signal, callback);
+        });
+        break;
+    }
+};
+
+function killAll (tree, signal, callback) {
+    var killed = {};
+    try {
+        Object.keys(tree).forEach(function (pid) {
+            tree[pid].forEach(function (pidpid) {
+                if (!killed[pidpid]) {
+                    killPid(pidpid, signal);
+                    killed[pidpid] = 1;
+                }
+            });
+            if (!killed[pid]) {
+                killPid(pid, signal);
+                killed[pid] = 1;
+            }
+        });
+    } catch (err) {
+        if (callback) {
+            return callback(err);
+        } else {
+            throw err;
+        }
+    }
+    if (callback) {
+        return callback();
+    }
+}
+
+function killPid(pid, signal) {
+    try {
+        process.kill(parseInt(pid, 10), signal);
+    }
+    catch (err) {
+        if (err.code !== 'ESRCH') throw err;
+    }
+}
+
+function buildProcessTree (parentPid, tree, pidsToProcess, spawnChildProcessesList, cb) {
+    var ps = spawnChildProcessesList(parentPid);
+    var allData = '';
+    ps.stdout.on('data', function (data) {
+        var data = data.toString('ascii');
+        allData += data;
+    });
+
+    var onClose = function (code) {
+        delete pidsToProcess[parentPid];
+
+        if (code != 0) {
+            // no more parent processes
+            if (Object.keys(pidsToProcess).length == 0) {
+                cb();
+            }
+            return;
+        }
+
+        allData.match(/\d+/g).forEach(function (pid) {
+          pid = parseInt(pid, 10);
+          tree[parentPid].push(pid);
+          tree[pid] = [];
+          pidsToProcess[pid] = 1;
+          buildProcessTree(pid, tree, pidsToProcess, spawnChildProcessesList, cb);
+        });
+    };
+
+    ps.on('close', onClose);
+}

node_modules/tree-kill/package.json

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+{
+  "name": "tree-kill",
+  "version": "1.2.2",
+  "description": "kill trees of processes",
+  "main": "index.js",
+  "types": "index.d.ts",
+  "bin": {
+    "tree-kill": "cli.js"
+  },
+  "scripts": {
+    "test": "mocha"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/pkrumins/node-tree-kill.git"
+  },
+  "homepage": "https://github.com/pkrumins/node-tree-kill",
+  "keywords": [
+    "tree",
+    "trees",
+    "process",
+    "processes",
+    "kill",
+    "signal"
+  ],
+  "author": {
+    "name": "Peteris Krumins",
+    "email": "peteris.krumins@gmail.com",
+    "url": "http://www.catonmat.net"
+  },
+  "contributors": [
+    {
+      "name": "Todd Wolfson",
+      "email": "todd@twolfson.com",
+      "url": "http://twolfson.com/"
+    },
+    {
+      "name": "William Hilton",
+      "email": "wmhilton@gmail.com",
+      "url": "http://wmhilton.com/"
+    },
+    {
+      "name": "Fabrício Matté",
+      "url": "http://ultcombo.js.org/"
+    }
+  ],
+  "license": "MIT",
+  "devDependencies": {
+    "mocha": "^2.2.5"
+  }
+}