[Backport version-15] feat(lease): implement lease renewal enhancement and UI consolidation

[github-actions]

Backport of #61 to version-15.

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PR Description

Summary
This PR introduces a structured Lease Renewal feature and optimizes the Lease Doctype UI by consolidating custom action buttons. It addresses the requirement for a controlled, authorized, and audited renewal process while improving the user experience.

Key Changes

1. UI/UX Consolidation

• Grouped the following buttons under a new "Actions" dropdown to reduce header clutter:
  • Make Invoice Schedule
  • Generate Pending Invoice
  • Make Invoice Schedule for all Lease
  • Renew Lease (New)
• Maintained existing report-related buttons under the "View" dropdown.
• Refactored intro banners to use frm.trigger("custom_set_intro") for a cleaner refresh event.

2. Lease Renewal Enhancement

• Trigger: Added a "Renew Lease" button accessible only for leases with Active or Expired status.
• Confirmation: Integrated frappe.confirm to ensure intentional action before renewal initiation.
• Validation:
  • Restricted initiation to Property Manager and System Manager roles.
  • Prevents duplicate renewals if a pending renewal already exists.
• Automation:
  • Automatically clones the existing lease document (excluding previous invoice schedules).
  • Sets the next start_date based on the previous lease's end date and maintains duration.
  • populates Renewed From and Renewal Initiated By fields for full traceability.
• Audit Trail: Automatically posts a comment to the original lease referencing the newly created draft.

3. Schema Updates (lease.json)

• Added Lease Renewal Details section.
• Added link fields: renewed_from (Lease) and renewal_initiated_by (User).