fix: add PostgreSQL array type support in pg_value_to_json

Handle _BOOL, _INT2, _INT4, _INT8, _FLOAT4, _FLOAT8, _TEXT, _VARCHAR,
_CHAR, _BPCHAR, _NAME, _UUID, _JSON, _JSONB array types so they render
as JSON arrays instead of "<unsupported type>".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-tauri/src/commands/queries.rs

@@ -58,6 +58,16 @@ pub fn pg_value_to_json(row: &PgRow, index: usize) -> Value {
             }
         }
         "VOID" => return Value::Null,
+        // Array types (PG prefixes array type names with underscore)
+        "_BOOL" => try_get!(Vec<bool>),
+        "_INT2" => try_get!(Vec<i16>),
+        "_INT4" => try_get!(Vec<i32>),
+        "_INT8" => try_get!(Vec<i64>),
+        "_FLOAT4" => try_get!(Vec<f32>),
+        "_FLOAT8" => try_get!(Vec<f64>),
+        "_TEXT" | "_VARCHAR" | "_CHAR" | "_BPCHAR" | "_NAME" => try_get!(Vec<String>),
+        "_UUID" => try_get!(Vec<uuid::Uuid>),
+        "_JSON" | "_JSONB" => try_get!(Vec<Value>),
         _ => {}
     }