feat(reconciliation): support held transactions and invoice requests

[Copilot]

Unreconciled transactions awaiting invoices repeatedly appear in Bank Reconciliation Beta. This adds a temporary hold workflow and a direct invoice-request action.

• On-hold workflow

  • Adds On Hold Until to Bank Transactions.
  • Excludes transactions held through the current date from the reconciliation list.
  • Adds an On Hold action tab for setting the hold deadline.

• Invoice requests

  • Adds recipient selection for Users, Contacts, and Employees.
  • Sends a standard invoice-request email linked to the Bank Transaction.
  • Optionally applies a hold deadline after sending the request.

• Configuration

  • Adds Banking Settings controls for automatically holding transactions after invoice requests.
  • Configures the hold threshold in days (default: 7).

if frappe.db.get_single_value("Banking Settings", "automatically_set_on_hold_after_invoice_request"):
    transaction.db_set("on_hold_until", add_days(nowdate(), threshold))

• Fixes Bank Reconciliation: Bank Transaction On Hold (and/or request invoice from Employees) #427

[PatrickDEissler]

Todo

• Make Recipient Type a link field and Recipient a dynamic link
• Add a JS and new fields, that fetches the email address from the respective dynamic link -> And show the field (also let it be editable) -> how to fetch email: User = email, Employee = user_id, Contact = email_id
• Make the doctype and dynamic link field not mandatory, only use them as a help to fetch email addresses. Only the resulting email address for sending requests shall be mandatory
• Also add a date field (that is pre-calculated based on the On Hold Threshold (from Banking Settings), till when the transaction will be on hold -> This calculated default can be changed/deleted.

NOTE: All feedback is in respect to "Request Invoice". The basic "On Hold" feature is fine.

[PatrickDEissler]

Todo

• Make Recipient Type a link field and Recipient a dynamic link
• Add a JS and new fields, that fetches the email address from the respective dynamic link -> And show the field (also let it be editable) -> how to fetch email: User = email, Employee = user_id, Contact = email_id
• Make the doctype and dynamic link field not mandatory, only use them as a help to fetch email addresses. Only the resulting email address for sending requests shall be mandatory
• Also add a date field (that is pre-calculated based on the On Hold Threshold (from Banking Settings), till when the transaction will be on hold -> This calculated default can be changed/deleted.

NOTE: All feedback is in respect to "Request Invoice". The basic "On Hold" feature is fine.