No exit leaves without fare money: starting one now requires Savings to cover the estimated hop fees (named in the refusal), and a mid-flight stall says exactly how many sats the next step needs and that it resumes on its own

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_019eA8JRq9Wr7z2fRQk99HLi

2 files changed, 10 insertions, 2 deletions

diff --git a/src/features/ark.js b/src/features/ark.js
index 14ac9c1..81e3351 100644
--- a/src/features/ark.js
+++ b/src/features/ark.js
@@ -1597,6 +1597,13 @@ export function arkFeature(ctx) {
       const mgr = await connectArk();
       const spendables = mgr.vtxos().filter((v) => v.state === 'spendable');
       if (!spendables.length) throw new Error(t('arkNotConnected'));
+      // Fees are paid hop by hop from Savings as the exit unrolls — an exit
+      // that can't fund its hops just stalls at step zero. Refuse to start
+      // one Savings can't carry, with the number on the table.
+      const feeEst = estimateExitFeeSat(mgr);
+      if ((wallet.spendable || 0) < feeEst) {
+        throw new Error(t('arkExitFeeShort', { need: fmtAmount(feeEst), have: fmtAmount(wallet.spendable || 0) }));
+      }
       for (const v of spendables) mgr.startExit(v.id);
       toast(t('arkExitStarted', { n: spendables.length }));
       driveExits(mgr).catch(() => {});
@@ -1650,7 +1657,7 @@ export function arkFeature(ctx) {
             mgr._save();
             return;
           } catch {
-            const e = new Error(t('arkExitNoFeeCoin'));
+            const e = new Error(t('arkExitNoFeeCoin', { need: fmtAmount(Math.max(294, feeSat)) }));
             e.actionable = true;
             throw e;
           }
diff --git a/src/i18n.js b/src/i18n.js
index 234c622..4eeca92 100644
--- a/src/i18n.js
+++ b/src/i18n.js
@@ -525,7 +525,8 @@ const STR = {
     arkOffboardHistory: 'Moved to Savings',
     arkExitBtn: 'Move to Savings without the server',
     arkExitStarted: 'Unilateral exit started for {n} coin(s) — broadcasting the exit chain.',
-    arkExitNoFeeCoin: 'This needs a little in Savings to pay the mining fees.',
+    arkExitNoFeeCoin: 'Paused: the next step needs about {need} sats in Savings for its mining fee. Top up Savings and it resumes by itself.',
+    arkExitFeeShort: 'Savings can’t cover the exit’s mining fees (about {need} sats needed, {have} available). Top up Savings first.',
     preimageLabel: 'Preimage',
     copyPreimage: 'Copy preimage',
     arkExitSummary: 'Moving {n} sats to Savings on-chain — about {eta} until it lands.',