Initial barcode scanner webapp

Camera-based barcode scanner using ZXing for decoding. Requests wide
video (256x2048), rotates to landscape for decoding, applies contrast
boost and tries both HybridBinarizer and GlobalHistogramBinarizer.
Includes camera selector, manual/auto focus controls, and focus slider.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package-lock.json

@@ -0,0 +1,46 @@
+{
+	"name": "phone-barcode",
+	"version": "1.0.0",
+	"lockfileVersion": 3,
+	"requires": true,
+	"packages": {
+		"": {
+			"name": "phone-barcode",
+			"version": "1.0.0",
+			"dependencies": {
+				"@zxing/library": "0.19.2"
+			}
+		},
+		"node_modules/@zxing/library": {
+			"version": "0.19.2",
+			"resolved": "https://registry.npmjs.org/@zxing/library/-/library-0.19.2.tgz",
+			"integrity": "sha512-0aCQIbGXsDHcBuRYuZRZfJeLRYiPfdLxIlh5bY7k+k2bkxFwzla+75VyFi1rnjU5hqaZogdSH+Dw013YDsQOjg==",
+			"license": "MIT",
+			"dependencies": {
+				"ts-custom-error": "^3.0.0"
+			},
+			"engines": {
+				"node": ">= 10.4.0"
+			},
+			"optionalDependencies": {
+				"@zxing/text-encoding": "~0.9.0"
+			}
+		},
+		"node_modules/@zxing/text-encoding": {
+			"version": "0.9.0",
+			"resolved": "https://registry.npmjs.org/@zxing/text-encoding/-/text-encoding-0.9.0.tgz",
+			"integrity": "sha512-U/4aVJ2mxI0aDNI8Uq0wEhMgY+u4CNtEb0om3+y3+niDAsoTCOB33UF0sxpzqzdqXLqmvc+vZyAt4O8pPdfkwA==",
+			"license": "(Unlicense OR Apache-2.0)",
+			"optional": true
+		},
+		"node_modules/ts-custom-error": {
+			"version": "3.3.1",
+			"resolved": "https://registry.npmjs.org/ts-custom-error/-/ts-custom-error-3.3.1.tgz",
+			"integrity": "sha512-5OX1tzOjxWEgsr/YEUWSuPrQ00deKLh6D7OTWcvNHm12/7QPyRh8SYpyWvA4IZv8H/+GQWQEh/kwo95Q9OVW1A==",
+			"license": "MIT",
+			"engines": {
+				"node": ">=14.0.0"
+			}
+		}
+	}
+}