Function object_kind_to_symbol_kind 

pub(super) fn object_kind_to_symbol_kind(kind: ObjectKind) -> SymbolKind

Map an ObjectKind to an LSP SymbolKind.

LSP has no SQL-specific symbol kinds, so we pick the closest semantic match:

ObjectKind	SymbolKind	Rationale
Table	STRUCT	Structured row data
View	FUNCTION	Computed from a query
MaterializedView	CLASS	Persistent computed relation
Source	INTERFACE	External data contract
Sink	MODULE	Data export target
Secret	CONSTANT	Opaque stored value
Connection	NAMESPACE	Named config grouping