feat(journal-entries): implemented journal entry editor & document blocks

[rmolinamir]

This PR implements a comprehensive journal entry editor with document block support, replacing the previous journal entry system with a more robust editing experience.

Closes:

• [Journal Entries] Add BlockNote to Journal Entries #37
• [Journal Entries] Chunk the entries #47

Key Features

• New Journal Entry Editor: Implemented a dynamic journal entry editor with rich block-based editing capabilities
• Document Block System: Added support for structured document blocks with proper schema and transactions
• Enhanced API Layer: Refactored journal and pages API routers for better block handling and document management
• Improved UI Components: Created new journal entry primitives, provider, and skeleton components for better UX

Technical Changes

• Added new journal entry editor components with dynamic loading
• Implemented block transaction system for document operations
• Enhanced database schemas for block nodes, documents, and journal entries
• Refactored AI tools for improved semantic and temporal journal searches
• Updated sidebar and layout components for better integration