fix(SyncProcess): Reduce size of continuation on disk

[marcelklehr]

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[Copilot]

Pull request overview

This PR optimizes the continuation persistence mechanism to reduce disk storage requirements by selectively persisting only the necessary state data based on the current sync stage. The changes introduce conditional logic to determine which members need to be persisted, add async JSON deserialization for better performance, and refactor tree indexing to use incremental updates instead of full rebuilds.

Key Changes

• Modified getMembersToPersist() methods in Default.ts and Unidirectional.ts to conditionally include state members based on sync progress, significantly reducing continuation size
• Introduced Diff.fromJSONAsync() for asynchronous JSON parsing and added setProgress() methods to properly hydrate persisted state
• Refactored tree index management with new updateIndex() and removeFromIndex() methods to incrementally maintain indexes instead of full rebuilds

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 14 comments.

Show a summary per file

File	Description
src/lib/strategies/Default.ts	Implements conditional member persistence based on sync stage and adds async progress restoration
src/lib/strategies/Unidirectional.ts	Applies similar conditional persistence logic for unidirectional sync and switches to async JSON parsing
src/lib/Tree.ts	Adds incremental index update methods (updateIndex, removeFromIndex) and exposes index property
src/lib/Diff.ts	Introduces fromJSONAsync method for async deserialization and includes code formatting improvements
src/lib/adapters/NextcloudBookmarks.ts	Replaces full createIndex() calls with incremental updateIndex() and removeFromIndex() operations
src/lib/adapters/Caching.ts	Updates index management to use incremental methods and fixes orderFolder logic
src/lib/LocalTabs.ts	Adds helper methods for ID conversion and changes folder ID format to use string prefixes
src/lib/browser/BrowserAccountStorage.js	Simplifies cache/mappings initialization by using setEntry directly instead of changeEntry
src/lib/CachingTreeWrapper.ts	Updates to use incremental index methods and adds proper tree copying
src/lib/Account.ts	Simplifies cache tree initialization during sync continuation
src/test/test.js	Wraps plain objects with Bookmark constructor for proper type handling

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