v15.57.0

## What's Changed
* Stops submission of **Employee Advance** records when the chosen _Advance Account_ is not of type Receivable, preventing selection of an incorrect account. (https://github.com/frappe/hrms/pull/4017)
* Employee Self Service users can now view **Leave Type** records, letting them see the available leave categories. (https://github.com/frappe/hrms/pull/4019)
* Hides the username/password fields on the HRMS login page when _Disable Username/Password Login_ is enabled in **System Settings**, so users no longer see a disabled login option. (https://github.com/frappe/hrms/pull/4025)
* Hides the HRMS app for Website Users who have the **Employee** role, preventing their login from redirecting to a forbidden Desk page. (https://github.com/frappe/hrms/pull/4028)
* Fixes incorrect recalculation of compensatory leave when cancelling a **Compensatory Leave Request**; the related **Leave Allocation** now keeps the correct remaining balance instead of resetting to zero. (https://github.com/frappe/hrms/pull/4030)
* Uses default salary amounts when calculating **Gratuity**, allowing the payout to be saved without error when a departing employee’s full loan balance is settled. (https://github.com/frappe/hrms/pull/4032)
* Displays the _Loan Repayment_ column in "Salary Register" only when the Lending app is installed, removing the empty column from systems that do not use lending. (https://github.com/frappe/hrms/pull/4036)
* Adds validation to **Additional Salary**: recurring entries must include both _From Date_ and _To Date_, and non-recurring entries must include a _Payroll Date_; if any required date is missing, a clear error message now appears. (https://github.com/frappe/hrms/pull/4040)
* Allows the local development servers for the frontend and roster modules to accept connections from any hostname, not just `localhost`, letting you preview the site from other devices on the same network. (https://github.com/frappe/hrms/pull/4057)
* Fixes errors that prevent updating records in **Bulk Salary Structure Assignment** when the system language is set to non-English. (https://github.com/frappe/hrms/pull/4062)
* Fixes doubled numbering in **Job Opening** records; new openings now receive the next number instead of skipping one. (https://github.com/frappe/hrms/pull/4059)


**Full Changelog**: https://github.com/frappe/hrms/compare/v15.56.0...v15.57.0
**Authors**: @iamkhanraheel, @AarDG10, @DanielRadlAMR, @asmitahase, @elshafei-developer, @Akshay-Arijentek, @nareshkannasln, @rohitwaghchaure, @sarathibalamurugan
**Reviewers**: @ruchamahabal, @asmitahase

<details>
<summary>AI content</summary>

 For these release notes, we used an LLM (OpenAI o3) to review and summarise the code changes, along with the associated issue and PR descriptions. It may contain typical errors and inaccuracies. You can read the prompt [here](https://github.com/barredterra/pretty_release_notes). 

Changes with the following labels were excluded:
- skip-release-notes

Changes with the following types were excluded:
- docs
 - chore
 - ci
 - style
 - refactor
 - test
 - build

</details>