Fix various splash radius for icon buttons

lib/views/chat/agent_message_tile.dart

@@ -81,6 +81,7 @@ class _AgentMessageTileState extends State<AgentMessageTile> {
                       const SizedBox(width: 20),
                       // Expand/Collapse button
                       IconButton(
+                        splashRadius: 0.1,
                         icon: Icon(isExpanded
                             ? Icons.keyboard_arrow_up
                             : Icons.keyboard_arrow_down),

lib/views/chat/chat_input_field.dart

@@ -57,6 +57,7 @@ class _ChatInputFieldState extends State<ChatInputField> {
                 hintText: 'Type a message...',
                 border: InputBorder.none,
                 suffixIcon: IconButton(
+                  splashRadius: 0.1,
                   icon: const Icon(Icons.send),
                   onPressed: widget.onSendPressed,
                 ),

lib/views/task/task_list_tile.dart

@@ -68,6 +68,7 @@ class _TaskListTileState extends State<TaskListTile> {
                 // If the task is selected, show a delete icon
                 if (_isSelected)
                   IconButton(
+                    splashRadius: 0.1,
                     icon: const Icon(Icons.close, color: Colors.black),
                     onPressed: widget.onDelete,
                   ),