Add pixel comparison mode to Compare tool (#6109)

Co-authored-by: Anthony Stirling <[email protected]>
Co-authored-by: EthanHealy01 <[email protected]>

frontend/package-lock.json

@@ -68,6 +68,7 @@
         "license-report": "^6.8.0",
         "pdfjs-dist": "^5.4.149",
         "peerjs": "^1.5.5",
+        "pixelmatch": "^7.1.0",
         "posthog-js": "^1.268.0",
         "qrcode.react": "^4.2.0",
         "react": "^19.1.1",
@@ -10880,6 +10881,18 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/pixelmatch": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/pixelmatch/-/pixelmatch-7.1.0.tgz",
+      "integrity": "sha512-1wrVzJ2STrpmONHKBy228LM1b84msXDUoAzVEl0R8Mz4Ce6EPr+IVtxm8+yvrqLYMHswREkjYFaMxnyGnaY3Ng==",
+      "license": "ISC",
+      "dependencies": {
+        "pngjs": "^7.0.0"
+      },
+      "bin": {
+        "pixelmatch": "bin/pixelmatch"
+      }
+    },
     "node_modules/pkg-types": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/pkg-types/-/pkg-types-1.3.1.tgz",
@@ -10934,6 +10947,15 @@
         "node": ">=4"
       }
     },
+    "node_modules/pngjs": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-7.0.0.tgz",
+      "integrity": "sha512-LKWqWJRhstyYo9pGvgor/ivk2w94eSjE3RGVuzLGlr3NmD8bf7RcYGze1mNdEHRP6TRP6rMuDHk5t44hnTRyow==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.19.0"
+      }
+    },
     "node_modules/postcss": {
       "version": "8.5.8",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.8.tgz",