feat(android): Inter, the desktop's typeface

The type ramp now draws in Inter Regular and SemiBold, the same two files
the desktop bundles, so the clients read as one app. Inter is declared
above the ramp: top-level properties initialise in file order, and the
ramp built first would have captured it as null and silently used the
system face. Its OFL text ships in the licences beside the notices.
Screenshots re-recorded.

android/app/src/main/java/io/narl/protonstream/ui/theme/Type.kt

@@ -2,9 +2,28 @@ package io.narl.protonstream.ui.theme
 
 import androidx.compose.material3.Typography
 import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.Font
+import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight
+import io.narl.protonstream.R
 import androidx.compose.ui.unit.sp
 
+/**
+ * Inter, the desktop client's face, from the same two files.
+ *
+ * Only Regular and SemiBold ship, as on the desktop. A `Medium` role resolves
+ * to Regular by the usual weight matching rather than to a synthesised bold,
+ * which is how the desktop draws it too.
+ *
+ * Above [ProtonTypography] on purpose: top-level properties initialise in
+ * file order, and a ramp built first would capture this as null and fall back
+ * to the system face without a word.
+ */
+internal val Inter = FontFamily(
+    Font(R.font.inter_regular, FontWeight.Normal),
+    Font(R.font.inter_semibold, FontWeight.SemiBold),
+)
+
 /**
  * The type ramp, which is the desktop client's type ramp.
  *
@@ -72,4 +91,5 @@ private fun role(size: Float, weight: FontWeight) = TextStyle(
     fontSize = size.sp,
     lineHeight = (size * 1.35f).sp,
     fontWeight = weight,
+    fontFamily = Inter,
 )