feat: Add "Search in article" filter checkbox to results page

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

webclient/src/Results.js

@@ -1,6 +1,7 @@
 import React, { useState, useEffect } from 'react';
-import { Link, useLocation } from 'react-router-dom';
+import { Link, useLocation, useHistory } from 'react-router-dom';
 import { Helmet } from 'react-helmet';
+import queryString from 'query-string';
 import { sourceLink, infoLine, logos } from './utils.js';
 import AbortController from 'abort-controller';
 
@@ -8,6 +9,19 @@ function Results() {
 	const [stories, setStories] = useState(false);
 	const [error, setError] = useState(false);
 	const location = useLocation();
+	const history = useHistory();
+
+	const handleFilterChange = e => {
+		const isChecked = e.target.checked;
+
+		const currentQuery = queryString.parse(location.search);
+		if (isChecked) {
+			currentQuery.article = 'true';
+		} else {
+			delete currentQuery.article;
+		}
+		history.push('/search?' + queryString.stringify(currentQuery));
+	};
 
 	useEffect(() => {
 		const controller = new AbortController();
@@ -32,11 +46,19 @@ function Results() {
 		};
 	}, [location.search]);
 
+	const searchInArticle = queryString.parse(location.search).article === 'true';
+
 	return (
 		<div className='container'>
 			<Helmet>
 				<title>Search Results | QotNews</title>
 			</Helmet>
+
+			<div style={{marginBottom: '1rem'}}>
+				<input type="checkbox" id="search-in-article" className="checkbox" checked={searchInArticle} onChange={handleFilterChange} />
+				<label htmlFor="search-in-article">Search in article</label>
+			</div>
+
 			{error && <p>Connection error?</p>}
 			{stories ?
 				<>