spend: check max feerate

Author: edouardparis

gui/src/app/state/spend/step.rs

@@ -10,6 +10,7 @@ use liana::{
     },
     spend::{
         create_spend, CandidateCoin, SpendCreationError, SpendOutputAddress, SpendTxFees, TxGetter,
+        MAX_FEERATE,
     },
 };
 
@@ -346,7 +347,7 @@ impl Step for DefineSpend {
                     view::CreateSpendMessage::FeerateEdited(s) => {
                         if let Ok(value) = s.parse::<u64>() {
                             self.feerate.value = s;
-                            self.feerate.valid = value != 0;
+                            self.feerate.valid = value != 0 && value <= MAX_FEERATE;
                         } else if s.is_empty() {
                             self.feerate.value = "".to_string();
                             self.feerate.valid = true;

gui/src/app/view/spend/mod.rs

@@ -176,7 +176,7 @@ pub fn create_spend_tx<'a>(
                                         Message::CreateSpend(CreateSpendMessage::FeerateEdited(msg))
                                     },
                                 )
-                                .warning("Invalid feerate")
+                                .warning("Feerate must be an integer less than or equal to 1000 sats/vbyte")
                                 .size(20)
                                 .padding(10),
                             )