chore(ops,docs): first-boot containers, image versions, design docs, android remote-input

- first-boot-containers + image-versions for fmcd/fedimint
- dual-ecash, meshroller-integration, and remaining-issues design docs
- Android remote-input two-finger scroll + external-open handling

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Android/app/src/main/java/com/archipelago/app/network/InputWebSocket.kt

@@ -35,6 +35,13 @@ class InputWebSocket(
     /** Player ID for arcade mode (0 = broadcast, 1 = P1, 2 = P2) */
     var playerId: Int = 0
 
+    /**
+     * Invoked when the kiosk asks us to open a URL in the phone's default
+     * browser ({"t":"o","url":"…"}). "Open in external browser" apps can't be
+     * usefully opened on the kiosk, so the kiosk forwards them here.
+     */
+    var onExternalOpen: ((String) -> Unit)? = null
+
     private val _state = MutableStateFlow(ConnectionState.DISCONNECTED)
     val state: StateFlow<ConnectionState> = _state
 
@@ -127,6 +134,20 @@ class InputWebSocket(
                 reconnectAttempt = 0
             }
 
+            override fun onMessage(webSocket: WebSocket, text: String) {
+                // The only inbound message we act on is an external-open request
+                // forwarded from the kiosk: {"t":"o","url":"https://…"}.
+                try {
+                    val obj = org.json.JSONObject(text)
+                    if (obj.optString("t") == "o") {
+                        val url = obj.optString("url")
+                        if (url.startsWith("http://") || url.startsWith("https://")) {
+                            onExternalOpen?.invoke(url)
+                        }
+                    }
+                } catch (_: Exception) {}
+            }
+
             override fun onFailure(webSocket: WebSocket, t: Throwable, response: Response?) {
                 _state.value = ConnectionState.ERROR
                 scheduleReconnect()

Android/app/src/main/java/com/archipelago/app/ui/screens/RemoteInputScreen.kt

@@ -63,6 +63,21 @@ fun RemoteInputScreen(onBack: () -> Unit) {
 
     val ws = remember { InputWebSocket(scope) }
 
+    // When the kiosk forwards an "open in external browser" app, launch it in
+    // the phone's default browser.
+    DisposableEffect(ws) {
+        ws.onExternalOpen = { url ->
+            try {
+                val intent = android.content.Intent(
+                    android.content.Intent.ACTION_VIEW,
+                    android.net.Uri.parse(url),
+                ).apply { addFlags(android.content.Intent.FLAG_ACTIVITY_NEW_TASK) }
+                context.startActivity(intent)
+            } catch (_: Exception) {}
+        }
+        onDispose { ws.onExternalOpen = null }
+    }
+
     fun togglePlayer() {
         playerId = when (playerId) { 0 -> 1; 1 -> 2; else -> 0 }
         ws.playerId = playerId