fix: drop normalization in address resolver

packages/keyring-api/src/api/v2/wrapper/keyring-address-resolver.test.ts

@@ -9,8 +9,8 @@
 
     expect(typeof id).toBe('string');
 
-    const resolvedAddress = resolver.getAddress(id);
-    expect(resolvedAddress).toBe(address.toLowerCase());
+      const resolvedAddress = resolver.getAddress(id);
+      expect(resolvedAddress).toBe(address);
 
     const resolvedId = resolver.getAccountId(address);
     expect(resolvedId).toBe(id);
@@ -21,7 +21,7 @@
 
     const address = '0xaBc';
     const firstId = resolver.register(address);
-    const secondId = resolver.register(address.toUpperCase());
+    const secondId = resolver.register(address);
 
     expect(firstId).toBe(secondId);
   });

packages/keyring-api/src/api/v2/wrapper/keyring-address-resolver.ts

@@ -36,19 +36,18 @@ export class InMemoryKeyringAddressResolver implements KeyringAddressResolver {
   }
 
   getAccountId(address: string): AccountId | undefined {
-    return this.#idByAddress.get(address.toLowerCase());
+    return this.#idByAddress.get(address);
   }
 
   register(address: string): AccountId {
-    const normalized = address.toLowerCase();
-    const existing = this.#idByAddress.get(normalized);
+    const existing = this.#idByAddress.get(address);
     if (existing) {
       return existing;
     }
     const id = uuidv4();
 
-    this.#idByAddress.set(normalized, id);
-    this.#addressById.set(id, normalized);
+    this.#idByAddress.set(address, id);
+    this.#addressById.set(id, address);
 
     return id;
   }