Add dark mode; gift amount unit toggle; multi-input gifts

- Dark mode: theme variables + a footer "Dark mode/Light mode" toggle,
  persisted and applied pre-paint via a small head script (defaults to the
  OS preference). Hardcoded surfaces moved to CSS variables.
- Gift amount: the unit label is now the clickable sats/BTC toggle, and the
  amount is parsed in the selected unit.
- Gifts can now span multiple coins: createGift selects several confirmed
  coins (first input SIGHASH_SINGLE to lock the change, the rest
  SIGHASH_NONE), so a gift larger than any single coin works. Claim/preview
  sum all inputs and size the fee by input count. Verified end-to-end.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/locales/de.json b/src/locales/de.json
index 803bbd0..1cb6769 100644
--- a/src/locales/de.json
+++ b/src/locales/de.json
@@ -213,5 +213,7 @@
   "importedKeyNote": "Diese Wallet wurde aus einem erweiterten privaten Schlüssel importiert und hat daher keine Wiederherstellungsphrase. Sichere diesen Schlüssel selbst, um die Wallet zu behalten.",
   "clearAll": "Alle löschen",
   "clearAllWarn": "⚠ Dies entfernt alle Wallets von diesem Gerät. Jede Wallet, deren Wiederherstellungsphrase oder Schlüssel du nicht gesichert hast, ist für immer verloren.",
-  "rename": "Umbenennen"
+  "rename": "Umbenennen",
+  "darkMode": "Dunkelmodus",
+  "lightMode": "Hellmodus"
 }
\ No newline at end of file