[Ahmed-Yaseen99]

🎯 What: Added comprehensive unit tests for LocalDatabase.MergeWithHistoryBulk in tests/NodeRadarPro.Tests/Data/LocalDatabaseTests.cs.

📊 Coverage:

• MergeWithHistoryBulk_EmptyOrInvalidNodes_ReturnsEmptyAndDoesNotModifyDb: Tests empty list inputs, null items in the list, and items with MAC address "Unknown".
• MergeWithHistoryBulk_NewValidNodes_InsertsNodesAndReturnsNewList: Tests bulk insertion of brand new valid nodes and verifies return value containing newly added nodes and DB persistence.
• MergeWithHistoryBulk_ExistingNodes_UpdatesFieldsAndReturnsEmptyList: Tests bulk updates for existing nodes, ensuring scanned fields are updated while preserving user-customized properties (CustomName, Notes, etc.).
• MergeWithHistoryBulk_MixedNodes_HandlesNewExistingAndInvalidCorrectly: Tests a mixed batch of nulls, invalid MAC nodes, existing nodes, and new nodes in a single call.

✨ Result: Ensures complete reliability and regression prevention for bulk database device history merging operations. All 540 unit tests pass.

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PR created automatically by Jules for task 10598533195190411532 started by @Ahmed-Yaseen99

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