Bulk safe Apex triggers are triggers that can handle large batches of records without hitting governor limits, such as the limit of 150 DML statements per transaction. One of the best practices for writing bulk safe Apex triggers is to add records to collections, such as lists or sets, and perform DML operations against these collections, instead of performing DML operations on individual records. This way, the developer can reduce the number of DML statements and optimize the performance of the trigger. For example, the developer can use a list to store the records that need to be updated, and use a single update statement to update the list, instead of using multiple update statements to update each record. Reference: [Bulk Apex Triggers], [DML Operations]

The most suitable approach for implementing this logic is to develop a custom Lightning component to handle the approval logic and integrate it into the expense reimbursement record page. A Lightning component is a reusable unit of an app that can include markup, JavaScript, CSS, and Apex. A Lightning component can use the Lightning Data Service or Apex to query data from Salesforce and display it on a Lightning page. A Lightning component can also use custom logic to determine the appropriate approver based on factors such as expense amount, employee role, and project type. By developing a custom Lightning component, the developer can create a custom UI element that can handle the approval logic and integrate it into the expense reimbursement record page. This way, the developer can leverage the Lightning framework and the Lightning Data Service or Apex to create a flexible and future-proof solution that meets the requirement. Reference: [Lightning Components Basics], [Lightning Data Service Basics], [Lightning Component Bundle]

The best way to identify the configuration changes that need to be moved into production is to leverage the Setup Audit Trail to review the changes made by the departed Administrator and identify which changes should be added to the Change Set. The Setup Audit Trail is a feature that tracks the recent setup changes that you and other administrators have made to your org. The Setup Audit Trail can show up to 180 days of history and can be downloaded as a CSV file. The Setup Audit Trail can help the developer to find out what configuration changes were made by the former administrator, such as creating or modifying objects, fields, workflows, processes, flows, etc. The developer can then use this information to complete the Change Set and deploy it to production . Reference: [View Setup Audit Trail], [Change Sets]

The best way to ensure error messages are properly displayed on a custom Lightning web component (LWC) is to add JavaScript and HTML to display an error message. The developer can use the try-catch block to handle the errors that occur in the JavaScript code, and use the template to render the error message in the HTML. The developer can also use the @wire or @api decorators to handle the errors that occur when calling an Apex method or receiving a property from a parent component. The DML statement, the Database method, and the apex:messages/ tag are not applicable for LWC, as they are used for Visualforce or Aura components. Reference: [Handle Errors in Lightning Web Components], [Lightning Web Components Developer Guide]

The best way to automatically give read only access to the User set in the Quality_Controller field is to use Apex managed sharing. Apex managed sharing is a way to programmatically create sharing rules for records based on custom logic. Apex managed sharing can be used to grant access to users or groups that do not have access to the records through the role hierarchy, ownership, or other sharing rules. Apex managed sharing can also specify the access level for the records, such as read only or read/write. Apex managed sharing can be implemented by creating a trigger on the Order object that invokes a class that implements the Database.Batchable interface and uses the Database.insert method to create the sharing records34. Reference: [Apex Managed Sharing], [Creating Apex Managed Sharing Rules], [Database.Batchable Interface], [Database.insert Method]