Add and use special monospace typeface for AEP.

app/src/main/java/org/thoughtcrime/securesms/fonts/MonoTypeface.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2025 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.fonts
+
+import android.graphics.Typeface
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontFamily
+
+/**
+ * Special monospace font, primarily used for rendering AEPs.
+ */
+object MonoTypeface {
+  private var cached: Typeface? = null
+
+  @Composable
+  fun fontFamily(): FontFamily {
+    val context = LocalContext.current
+    return FontFamily(cached ?: Typeface.createFromAsset(context.assets, "fonts/MonoSpecial-Regular.otf").also { cached = it })
+  }
+}