feat(build): support A11Y_FINGERPRINT_PATH env var for fingerprint module override

Allow overriding the fingerprint module path via environment variable,
useful for non-standard monorepo layouts or custom build environments.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Abhishek Bindra

build/tasks/esbuild.js

@@ -4,12 +4,19 @@ const fs = require('fs');
 
 // [a11y-core]: resolve ip-protection imports to real file in monorepo,
 // or fall back to a stub when building axe-core standalone (CI).
+// Set A11Y_FINGERPRINT_PATH env var to override the fingerprint module location.
 const fingerprintFallback = {
   name: 'a11y-fingerprint-fallback',
   setup(pluginBuild) {
     pluginBuild.onResolve(
       { filter: /ip-protection\/utils\/fingerprint/ },
       args => {
+        if (process.env.A11Y_FINGERPRINT_PATH) {
+          const envPath = path.resolve(process.env.A11Y_FINGERPRINT_PATH);
+          if (fs.existsSync(envPath)) {
+            return { path: envPath };
+          }
+        }
         const realPath = path.resolve(args.resolveDir, args.path + '.js');
         if (fs.existsSync(realPath)) {
           return { path: realPath };