Phase 2: Test reorganization and modernization

Changes:
- Add new BranchSDKTests/ directory with 48 test files
  - Comprehensive unit tests for SDK components
  - Modern XCTest-based test structure
  - Includes test plan and Info.plist

- Update Branch-TestBed/ (28 files modified)
  - Modernize imports from #import to @import BranchSDK
  - Update bridging header
  - Update Xcode schemes
  - Update project configuration

Test Organization:
- BranchSDKTests/: New comprehensive test suite
- Branch-TestBed/: Updated integration tests
- All tests use modern import style (@import)

Build Status: ✅ SDK build successful
Test Files: 76 files changed (48 new, 28 modified)

Note: TestDeepLinking removal will be handled separately

Author: wpinho-branch

Branch-TestBed/Branch-SDK-Tests/BNCAPIServerTest.m

@@ -11,7 +11,7 @@
 #import "BNCSystemObserver.h"
 #import "BNCConfig.h"
 #import "BranchConstants.h"
-#import "Branch.h"
+@import BranchSDK;
 
 @interface BNCAPIServerTest : XCTestCase
 

Branch-TestBed/Branch-SDK-Tests/BNCODMTests.m

@@ -7,7 +7,7 @@
 //
 
 #import <XCTest/XCTest.h>
-#import "Branch.h"
+@import BranchSDK;
 #import "BNCPreferenceHelper.h"
 #import "BNCRequestFactory.h"
 #import "BNCEncodingUtils.h"

Branch-TestBed/Branch-SDK-Tests/BNCPasteboardTests.m

@@ -8,7 +8,7 @@
 
 #import <XCTest/XCTest.h>
 #import "BNCPasteboard.h"
-#import "Branch.h"
+@import BranchSDK;
 
 @interface BNCPasteboardTests : XCTestCase
 

Branch-TestBed/Branch-SDK-Tests/BNCPreferenceHelperTests.m

@@ -9,7 +9,7 @@
 #import <XCTest/XCTest.h>
 #import "BNCPreferenceHelper.h"
 #import "BNCEncodingUtils.h"
-#import "Branch.h"
+@import BranchSDK;
 #import "BNCConfig.h"
 
 @interface BNCPreferenceHelper()

Branch-TestBed/Branch-SDK-Tests/Branch-SDK-Tests-Bridging-Header.h

@@ -2,4 +2,4 @@
 //  Module headers for Branch SDK unit testing.
 //
 
-#import "Branch.h"
+@import BranchSDK;

Branch-TestBed/Branch-SDK-Tests/BranchActivityItemTests.m

@@ -7,7 +7,7 @@
 //
 
 #import <XCTest/XCTest.h>
-#import "Branch.h"
+@import BranchSDK;
 
 @interface BranchActivityItemTests: XCTestCase
 @end

Branch-TestBed/Branch-SDK-Tests/BranchClassTests.m

@@ -7,7 +7,7 @@
 //
 
 #import <XCTest/XCTest.h>
-#import "Branch.h"
+@import BranchSDK;
 #import "BranchConstants.h"
 #import "BNCPasteboard.h"
 #import "BNCAppGroupsData.h"

Branch-TestBed/Branch-SDK-Tests/BranchLoggerTests.m

@@ -8,7 +8,7 @@
 
 #import <XCTest/XCTest.h>
 #import "BranchLogger.h"
-#import "Branch.h"
+@import BranchSDK;
 
 @interface BranchLoggerTests : XCTestCase
 

Branch-TestBed/Branch-SDK-Tests/BranchQRCodeTests.m

@@ -7,7 +7,7 @@
 //
 
 #import <XCTest/XCTest.h>
-#import "Branch.h"
+@import BranchSDK;
 #import "BranchQRCode.h"
 #import "BNCQRCodeCache.h"
 

Branch-TestBed/Branch-SDK-Tests/BranchShareLinkTests.m

@@ -9,7 +9,7 @@
 #import <XCTest/XCTest.h>
 #import "BranchShareLink.h"
 #import "BranchLinkProperties.h"
-#import "Branch.h"
+@import BranchSDK;
 
 @interface BranchShareLinkTests : XCTestCase