Rebuild as single-file offline BIP84 wallet

Replace the SvelteKit/daisyUI prototype with a vanilla JS + hand-rolled CSS
app that Bun bundles (code + scure/noble crypto + QR + CSS) into one
self-contained dist/index.html runnable offline from file://.

Wallet core (src/wallet.js):
- BIP84 native-segwit HD wallet from BIP39 seed (+optional passphrase)
- gap-limit scan of receive/change chains, aggregate balance, tx history
- fresh receive/change addresses; signs with witnessUtxo only (enables
  offline signing with no prev-tx fetch)
- coin selection + fee estimation via btc-signer selectUTXO; send-max;
  manual coin control
- offline JSON snapshot export/import (keyless) + signed-tx hex/QR export
- realtime mempool.space WebSocket: track-addresses -> debounced auto
  refresh of balances/history (no polling); live status badge

UI (src/app.js): clean light paper-wallet; create (with optional, skippable
backup verification) / import flow; receive (QR) / send / history / coins /
tools tabs; clickable logo returns home.

API (src/api.js): mempool.space wrapper with retry/backoff for scan-burst
rate limiting; single network choke-point for offline enforcement.

Verified: BIP84 spec vectors, build/sign/parse for auto/max/manual flows,
snapshot roundtrip, live scan + WebSocket, headless-Chrome UI smoke tests.

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

1 files changed, 0 insertions, 23 deletions

diff --git a/src/app.css b/src/app.css
deleted file mode 100644
index cafcee5..0000000
--- a/src/app.css
+++ /dev/null
@@ -1,23 +0,0 @@
-@import 'tailwindcss';
-@plugin '@tailwindcss/forms';
-@plugin '@tailwindcss/typography';
-@plugin "daisyui";
-
-html { height: 100%; }
-html, body {
-  margin: 0;
-  padding: 0;
-  overflow-x: hidden;
-}
-
-body {
-  padding-top: 40px;
-}
-
-html {
-  background-image: url('/bg.webp');
-  background-size: cover;
-  background-position: center;
-  background-repeat: no-repeat;
-}
-