Fix: Gracefully ignore unsupported NWC response types (e.g. get_info)

When another NWC client (e.g. Alby) connected to the same relay calls
`get_info`, Damus receives the response and previously threw a
DecodingError.typeMismatch, causing an "Oops" error dialog to be shown.

Fix: Make `result_type` optional in `WalletConnect.Response`. Unknown
result types now decode without throwing — `result_type` and `result`
are set to `nil`, and the rest of the existing nil-guarded code paths
handle this silently.

Adds a test to verify `get_info` (and any future unknown result type)
is decoded gracefully.

Closes: #2204
Changelog-Fixed: Fixed issue where the app could display an error message when using another NWC wallet in parallel
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: danieldaquino <24692108+danieldaquino@users.noreply.github.com>
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>

damusTests/WalletConnectTests.swift

@@ -233,4 +233,30 @@ final class WalletConnectTests: XCTestCase {
         encodedRequest = try encoded_request_with_type(type: "outgoing")
         XCTAssertTrue(encodedRequest.contains("\"type\":\"outgoing\""))
     }
+    
+    /// Tests that responses with an unknown `result_type` (e.g. `get_info` from a different NWC client)
+    /// are decoded gracefully without throwing an error.
+    func testDecodingUnknownResultTypeIsGraceful() throws {
+        let jsonData = """
+        {
+            "result_type": "get_info",
+            "error": null,
+            "result": {
+                "alias": "some-wallet",
+                "color": "#3399FF",
+                "pubkey": "abc123",
+                "network": "mainnet",
+                "block_height": 800000,
+                "block_hash": "000000",
+                "methods": ["pay_invoice", "get_balance", "get_info"]
+            }
+        }
+        """.data(using: .utf8)!
+        
+        let response = try JSONDecoder().decode(WalletConnect.Response.self, from: jsonData)
+        
+        XCTAssertNil(response.result_type, "Unknown result_type should be nil")
+        XCTAssertNil(response.result, "Result should be nil for unknown result_type")
+        XCTAssertNil(response.error, "Error should be nil for a successful get_info response")
+    }
 }