fix: restore LDK Node rev to v0.7.0-rc.36 and add LightningAmountConversion to notification target

The previous commit (851826f) reverted the LDK Node pin to c5698d0,
thinking it was the master-pinned version. But master had already moved
to ae38ead (v0.7.0-rc.36) via PR #502 (stale monitor recovery), which
added BuildError.DangerousValue.

This caused three build errors:
- "Type 'BuildError' has no member 'DangerousValue'" (Bitkit, BitkitNotification, BitkitTests)
- "Cannot find 'LightningAmountConversion' in scope" (BitkitNotification)

The revision was hardcoded in the pbxproj package requirement (not just
Package.resolved), so Xcode kept re-resolving to the old version on
every build.

Additionally, the project had two conflicting ldk-node package
references: lightningdevkit/ldk-node (tracking main branch) and
synonymdev/ldk-node (pinned revision). Both shared the same SPM
identity, causing resolution failures after SPM cache resets.

Fixes:
- Update ldk-node revision in pbxproj to ae38ead (v0.7.0-rc.36)
- Add LightningAmountConversion.swift to BitkitNotification target
  (PaymentDetails.swift was already in that target but referenced it)
- Remove stale lightningdevkit/ldk-node package reference and rewire
  Bitkit target to use synonymdev/ldk-node (single source of truth)

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

Author: ovitrif

Bitkit.xcodeproj/project.pbxproj

@@ -123,6 +123,7 @@
 				Utilities/Crypto.swift,
 				Utilities/Errors.swift,
 				Utilities/Keychain.swift,
+				Utilities/LightningAmountConversion.swift,
 				Utilities/Logger.swift,
 				Utilities/StateLocker.swift,
 			);
@@ -917,20 +918,12 @@
 				minimumVersion = 2.1.2;
 			};
 		};
-		962045C92DE998F1007BAA26 /* XCRemoteSwiftPackageReference "ldk-node" */ = {
-			isa = XCRemoteSwiftPackageReference;
-			repositoryURL = "https://github.com/lightningdevkit/ldk-node";
-			requirement = {
-				branch = main;
-				kind = branch;
-			};
-		};
 		968FE13E2DFB016B0053CD7F /* XCRemoteSwiftPackageReference "ldk-node" */ = {
 			isa = XCRemoteSwiftPackageReference;
 			repositoryURL = "https://github.com/synonymdev/ldk-node";
 			requirement = {
 				kind = revision;
-				revision = c5698d00066e0e50f33696afc562d71023da2373;
+				revision = ae38eadab70fceb5dbe242bc02bf895581cb7c3f;
 			};
 		};
 		96DEA0382DE8BBA1009932BF /* XCRemoteSwiftPackageReference "bitkit-core" */ = {
@@ -987,7 +980,7 @@
 		};
 		9613018B2C5022D700878183 /* LDKNode */ = {
 			isa = XCSwiftPackageProductDependency;
-			package = 962045C92DE998F1007BAA26 /* XCRemoteSwiftPackageReference "ldk-node" */;
+			package = 968FE13E2DFB016B0053CD7F /* XCRemoteSwiftPackageReference "ldk-node" */;
 			productName = LDKNode;
 		};
 		968FE13F2DFB016B0053CD7F /* LDKNode */ = {