fix(treesitter): fix helper and context edge cases

- return true when no previous sibling in previous_sibling_completed
- fix delete -> delete_statement clause mapping
- fix typo speciifcation -> specification

Author: JulesWritesCode

crates/pgls_completions/src/providers/columns.rs

@@ -447,7 +447,7 @@ mod tests {
                         "select name from instruments i join others o on i.z = o.a <sql>",
                     )
                     .type_sql("where o.<1>a = <2>i.z and <3>i.id > 5;")
-                    .comment("should respect alias speciifcation")
+                    .comment("should respect alias specification")
                     .comment("should not prioritize suggest columns or schemas (right side of binary expression)")
                     .comment("should prioritize columns that aren't already mentioned"),
             )

crates/pgls_treesitter/src/context/mod.rs

@@ -384,7 +384,7 @@ impl<'a> TreesitterContext<'a> {
             "where" => Some(WrappingClause::Where),
             "update" => Some(WrappingClause::Update),
             "select" => Some(WrappingClause::Select),
-            "delete" => Some(WrappingClause::Delete),
+            "delete_statement" => Some(WrappingClause::Delete),
             "from" => Some(WrappingClause::From),
             "drop_table" => Some(WrappingClause::DropTable),
             "alter_role" => Some(WrappingClause::AlterRole),

crates/pgls_treesitter/src/helper.rs

@@ -97,7 +97,7 @@ pub fn previous_sibling_completed(node: tree_sitter::Node) -> bool {
 
         is_finished && last_children_completed(prev)
     } else {
-        false
+        true
     }
 }