feat: various UI fixes, prompt optimizations, and allowing duplicate docs

- Updated `content_hash` in the `Document` model to remove global uniqueness, allowing identical content across different paths.
- Enhanced `_create_document` function to handle path uniqueness and prevent session-poisoning from `IntegrityError`.
- Added detailed comments for clarity on the changes and their implications.
- Introduced new citation handling in the editor for improved user experience with citation jumps.
- Updated package dependencies in the frontend for better functionality.

surfsense_backend/app/db.py

@@ -976,7 +976,15 @@ class Document(BaseModel, TimestampMixin):
     document_metadata = Column(JSON, nullable=True)
 
     content = Column(Text, nullable=False)
-    content_hash = Column(String, nullable=False, index=True, unique=True)
+    # ``content_hash`` is intentionally NOT globally unique. In a real
+    # filesystem two files at different paths can hold identical bytes,
+    # and the agent's ``write_file`` flow needs that semantic to support
+    # copy / duplicate operations. Path uniqueness lives on
+    # ``unique_identifier_hash`` (per search space). The hash remains
+    # indexed because connector indexers consult it as a change-detection
+    # / cross-source dedup hint via :func:`check_duplicate_document`.
+    # See migration 133.
+    content_hash = Column(String, nullable=False, index=True)
     unique_identifier_hash = Column(String, nullable=True, index=True, unique=True)
     embedding = Column(Vector(config.embedding_model_instance.dimension))