chore: remove legacy @zxing packages and old decoder implementation

Remove @zxing/browser and @zxing/library dependencies as they have been fully replaced by zxing-wasm. Delete old barcodeDecoder.ts file which is no longer used after migration to barcodeDecoderWasm.ts.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package-lock.json

@@ -15,8 +15,6 @@
         "@tailwindcss/typography": "^0.5.10",
         "@types/iban": "^0.0.35",
         "@types/node": "20.5.7",
-        "@zxing/browser": "^0.1.5",
-        "@zxing/library": "^0.21.3",
         "autoprefixer": "10.4.15",
         "bcrypt": "^5.1.1",
         "clsx": "^2.0.0",
@@ -2219,38 +2217,6 @@
         }
       }
     },
-    "node_modules/@zxing/browser": {
-      "version": "0.1.5",
-      "resolved": "https://registry.npmjs.org/@zxing/browser/-/browser-0.1.5.tgz",
-      "integrity": "sha512-4Lmrn/il4+UNb87Gk8h1iWnhj39TASEHpd91CwwSJtY5u+wa0iH9qS0wNLAWbNVYXR66WmT5uiMhZ7oVTrKfxw==",
-      "optionalDependencies": {
-        "@zxing/text-encoding": "^0.9.0"
-      },
-      "peerDependencies": {
-        "@zxing/library": "^0.21.0"
-      }
-    },
-    "node_modules/@zxing/library": {
-      "version": "0.21.3",
-      "resolved": "https://registry.npmjs.org/@zxing/library/-/library-0.21.3.tgz",
-      "integrity": "sha512-hZHqFe2JyH/ZxviJZosZjV+2s6EDSY0O24R+FQmlWZBZXP9IqMo7S3nb3+2LBWxodJQkSurdQGnqE7KXqrYgow==",
-      "peer": true,
-      "dependencies": {
-        "ts-custom-error": "^3.2.1"
-      },
-      "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==",
-      "optional": true
-    },
     "node_modules/abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -8191,14 +8157,6 @@
         "typescript": ">=4.2.0"
       }
     },
-    "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==",
-      "engines": {
-        "node": ">=14.0.0"
-      }
-    },
     "node_modules/ts-interface-checker": {
       "version": "0.1.13",
       "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",