feat: add dlv_account_reconciliation_rest_amount — show rest amount on bank reconciliation screen

dlv_account_reconciliation_rest_amount/ROADMAP.md

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+# Roadmap
+
+Planned extensions to the reconciliation rest-amount addon. Items are grouped
+by target release and are subject to change.
+
+## v1.1 — Suggest matching entries by rest amount
+
+- When a line's rest amount matches (exactly, or within a small tolerance)
+  another open entry for the same partner, surface it as a suggested match
+  in the "Match with existing entries" tab instead of requiring the user to
+  find it manually.
+
+## Future — Configurable tolerance / rounding
+
+- Allow a small configurable rounding tolerance when comparing rest amounts,
+  to account for currency rounding differences.