add a dialog with payment details for each payment.

for outgoing payments this needs a preimage to be good,
but we don't have it yet because we don't get it from
backends.

lnbits/static/css/base.css

@@ -66,3 +66,12 @@ a.inherit {
         direction: ltr;
         -moz-font-feature-settings: 'liga';
         -moz-osx-font-smoothing: grayscale; }
+
+.text-wrap {
+  word-wrap: break-word;
+  word-break: break-all;
+}
+
+.mono {
+  font-family: monospace;
+}