feat: initial Pezkuwi Apps rebrand from polkadot-apps

Rebranded terminology:
- Polkadot → Pezkuwi
- Kusama → Dicle
- Westend → Zagros
- Rococo → PezkuwiChain
- Substrate → Bizinikiwi
- parachain → teyrchain

Custom logos with Kurdistan brand colors (#e6007a → #86e62a):
- bizinikiwi-hexagon.svg
- sora-bizinikiwi.svg
- hezscanner.svg
- heztreasury.svg
- pezkuwiscan.svg
- pezkuwistats.svg
- pezkuwiassembly.svg
- pezkuwiholic.svg

packages/react-components/src/ExpandButton.tsx

@@ -0,0 +1,38 @@
+// Copyright 2017-2025 @pezkuwi/react-components authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import React from 'react';
+
+import Icon from './Icon.js';
+import { styled } from './styled.js';
+
+interface Props {
+  onClick: () => void;
+  expanded: boolean;
+  className?: string;
+}
+
+function ExpandButton ({ className = '', expanded, onClick }: Props): React.ReactElement<Props> {
+  return (
+    <StyledDiv
+      className={`${className} ui--ExpandButton`}
+      data-testid='row-toggle'
+      onClick={onClick}
+    >
+      <Icon icon={expanded ? 'caret-up' : 'caret-down'} />
+    </StyledDiv>
+  );
+}
+
+const StyledDiv = styled.div`
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 1.7rem;
+  height: 1.7rem;
+  border: 1px solid var(--border-table);
+  border-radius: 4px;
+  cursor: pointer;
+`;
+
+export default React.memo(ExpandButton);