feat(machine): add Zeus and Lightning.Pub QR codes to mock UI

dev.sh atm auto-injects VITE_LNDCONNECT_URL from lnd-3 credentials.
Idle screen shows "Zeus QR" and "Lightning.Pub nprofile" buttons (debug
mode) that open fullscreen overlays with scannable 400px QR codes and
copy-to-clipboard support. Also makes the debug overlay collapsible.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker/dev.sh

@@ -980,6 +980,13 @@ cmd_atm() {
         fi
     fi
 
+    # Auto-generate lndconnect URI for Zeus QR in mock UI
+    local lndconnect=$(generate_lndconnect 2>/dev/null || echo "")
+    if [[ -n "$lndconnect" ]]; then
+        export VITE_LNDCONNECT_URL="$lndconnect"
+        log "Zeus lndconnect injected into ATM UI"
+    fi
+
     if [[ "$background" == "true" ]]; then
         local log_file="$STATE_DIR/atm.log"
         log "Starting ATM application in background..."
@@ -997,6 +1004,9 @@ cmd_atm() {
         echo -e "${CYAN}ATM Mock Mode:${NC}"
         echo "  - Press 'b' to insert a bill (simulates cash insertion)"
         echo "  - Use the UI to complete transactions"
+        if [[ -n "$lndconnect" ]]; then
+            echo -e "  - ${GREEN}Zeus QR available on idle screen${NC}"
+        fi
         echo ""
         cd "$atm_dir" && pnpm dev
     fi