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/indent-string/index.d.ts

@@ -0,0 +1,42 @@
+declare namespace indentString {
+	interface Options {
+		/**
+		The string to use for the indent.
+
+		@default ' '
+		*/
+		readonly indent?: string;
+
+		/**
+		Also indent empty lines.
+
+		@default false
+		*/
+		readonly includeEmptyLines?: boolean;
+	}
+}
+
+/**
+Indent each line in a string.
+
+@param string - The string to indent.
+@param count - How many times you want `options.indent` repeated. Default: `1`.
+
+@example
+```
+import indentString = require('indent-string');
+
+indentString('Unicorns\nRainbows', 4);
+//=> '    Unicorns\n    Rainbows'
+
+indentString('Unicorns\nRainbows', 4, {indent: '♥'});
+//=> '♥♥♥♥Unicorns\n♥♥♥♥Rainbows'
+```
+*/
+declare function indentString(
+	string: string,
+	count?: number,
+	options?: indentString.Options
+): string;
+
+export = indentString;

node_modules/indent-string/index.js

@@ -0,0 +1,35 @@
+'use strict';
+
+module.exports = (string, count = 1, options) => {
+	options = {
+		indent: ' ',
+		includeEmptyLines: false,
+		...options
+	};
+
+	if (typeof string !== 'string') {
+		throw new TypeError(
+			`Expected \`input\` to be a \`string\`, got \`${typeof string}\``
+		);
+	}
+
+	if (typeof count !== 'number') {
+		throw new TypeError(
+			`Expected \`count\` to be a \`number\`, got \`${typeof count}\``
+		);
+	}
+
+	if (typeof options.indent !== 'string') {
+		throw new TypeError(
+			`Expected \`options.indent\` to be a \`string\`, got \`${typeof options.indent}\``
+		);
+	}
+
+	if (count === 0) {
+		return string;
+	}
+
+	const regex = options.includeEmptyLines ? /^/gm : /^(?!\s*$)/gm;
+
+	return string.replace(regex, options.indent.repeat(count));
+};

node_modules/indent-string/license

@@ -0,0 +1,9 @@
+MIT License
+
+Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
+
+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/indent-string/package.json

@@ -0,0 +1,37 @@
+{
+	"name": "indent-string",
+	"version": "4.0.0",
+	"description": "Indent each line in a string",
+	"license": "MIT",
+	"repository": "sindresorhus/indent-string",
+	"author": {
+		"name": "Sindre Sorhus",
+		"email": "sindresorhus@gmail.com",
+		"url": "sindresorhus.com"
+	},
+	"engines": {
+		"node": ">=8"
+	},
+	"scripts": {
+		"test": "xo && ava && tsd"
+	},
+	"files": [
+		"index.js",
+		"index.d.ts"
+	],
+	"keywords": [
+		"indent",
+		"string",
+		"pad",
+		"align",
+		"line",
+		"text",
+		"each",
+		"every"
+	],
+	"devDependencies": {
+		"ava": "^1.4.1",
+		"tsd": "^0.7.2",
+		"xo": "^0.24.0"
+	}
+}

node_modules/indent-string/readme.md

@@ -0,0 +1,70 @@
+# indent-string [![Build Status](https://travis-ci.org/sindresorhus/indent-string.svg?branch=master)](https://travis-ci.org/sindresorhus/indent-string)
+
+> Indent each line in a string
+
+
+## Install
+
+```
+$ npm install indent-string
+```
+
+
+## Usage
+
+```js
+const indentString = require('indent-string');
+
+indentString('Unicorns\nRainbows', 4);
+//=> '    Unicorns\n    Rainbows'
+
+indentString('Unicorns\nRainbows', 4, {indent: '♥'});
+//=> '♥♥♥♥Unicorns\n♥♥♥♥Rainbows'
+```
+
+
+## API
+
+### indentString(string, [count], [options])
+
+#### string
+
+Type: `string`
+
+The string to indent.
+
+#### count
+
+Type: `number`<br>
+Default: `1`
+
+How many times you want `options.indent` repeated.
+
+#### options
+
+Type: `object`
+
+##### indent
+
+Type: `string`<br>
+Default: `' '`
+
+The string to use for the indent.
+
+##### includeEmptyLines
+
+Type: `boolean`<br>
+Default: `false`
+
+Also indent empty lines.
+
+
+## Related
+
+- [indent-string-cli](https://github.com/sindresorhus/indent-string-cli) - CLI for this module
+- [strip-indent](https://github.com/sindresorhus/strip-indent) - Strip leading whitespace from every line in a string
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)