fix: exclude disabled users from approver list

[nareshkannasln]

Description: Approver searches in get_approvers() return disabled Users for leave, expense, and shift approvals. Filter both the direct employee approvers and the department-tree approvers on enabled = 1 so deactivated users are no longer selectable.

Before:

Screencast.from.2026-07-16.12-53-05.webm

After:

Screencast.from.2026-07-16.12-49-50.webm

Backport needed for v15, v16

[greptile-apps]

Confidence Score: 5/5

Safe to merge — the change is narrow, additive, and correctly filters disabled users at the query level.

Both the direct lookup path and the department-tree loop correctly add the enabled filter; the frappe.qb migration preserves all existing conditions and the @frappe.validate_and_sanitize_search_inputs decorator continues to protect the txt input.

No files require special attention.

_{Reviews (2): Last reviewed commit: "chore: update query to qb" | Re-trigger Greptile}

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