Add modal input state and rails

src/mobile_acceptance.zig

@@ -70,13 +70,19 @@ fn containsForbiddenToken(line: []const u8) bool {
 test "regular: mobile trace performs code edit with leader save and quit" {
     const trace =
         \\open 
+        \\type i
         \\type call
         \\key space
+        \\type n
+        \\key space
         \\key p
         \\key p
+        \\type i
         \\type arg
         \\key right
         \\key space
+        \\type n
+        \\key space
         \\key p
         \\key s
         \\key space
@@ -91,14 +97,20 @@ test "regular: mobile trace performs code edit with leader save and quit" {
 test "regular: mobile trace edits UTF-8 and hard-to-reach braces" {
     const trace =
         \\open safe
+        \\type i
         \\type é
         \\key backspace
         \\key space
+        \\type n
+        \\key space
         \\key p
         \\key c
+        \\type i
         \\type x
         \\key right
         \\key space
+        \\type n
+        \\key space
         \\key s
         \\key space
         \\key q