refactor(wip): add TextFieldState to ViewModels and call sites

Part of the BasicTextField migration. Adding TextFieldState properties
alongside existing TextFieldValue for backward compatibility.

https://claude.ai/code/session_014FZPV258VfdeE1mcyeU7wU

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/creators/zapsplits/IZapField.kt

@@ -20,6 +20,7 @@
  */
 package com.vitorpamplona.amethyst.ui.note.creators.zapsplits
 
+import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.runtime.MutableState
 import androidx.compose.runtime.Stable
 import androidx.compose.ui.text.input.TextFieldValue
@@ -29,6 +30,7 @@ import com.vitorpamplona.amethyst.model.User
 interface IZapField {
     val forwardZapTo: MutableState<SplitBuilder<User>>
     val forwardZapToEditting: MutableState<TextFieldValue>
+    val forwardZapToEdittingState: TextFieldState
 
     fun updateZapFromText()