fix(edit): put the keyboard away when the calendar picker takes over

Opening the picker from a focused field left the IME up — the picker's own
window doesn't pan (ADJUST_NOTHING), so the keyboard simply stayed, and
following the "Missing a calendar?" row carried it onto the calendar manager,
where nothing could type into it.

Focus is cleared and the IME hidden as the picker opens. The controller is
read in the form's window, where the focused field actually lives — reading
it inside the picker would address the dialog's window instead. The field
keeps its text; only focus and the keyboard go.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/src/main/java/de/jeanlucmakiola/calendula/ui/edit/EventEditScreen.kt

@@ -89,6 +89,8 @@ import androidx.compose.ui.graphics.isSpecified
 import androidx.compose.ui.graphics.Shape
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalFocusManager
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
 import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
@@ -512,6 +514,10 @@ private fun EventEditContent(
     // they're locked here; everything else (reminders, location, notes) is the
     // user's to edit.
     val locked = state.isManaged
+    // Read in the form's own window, not the picker's: the field holding focus
+    // lives here, so this is the controller that can put its keyboard away.
+    val focusManager = LocalFocusManager.current
+    val keyboardController = LocalSoftwareKeyboardController.current
     var picker by remember { mutableStateOf<PickerTarget?>(null) }
     var showCalendarPicker by rememberSaveable { mutableStateOf(false) }
     var showReminderPicker by rememberSaveable { mutableStateOf(false) }
@@ -1117,6 +1123,17 @@ private fun EventEditContent(
         null -> Unit
     }
 
+    // A full-screen picker over the form is a change of place, so the form's
+    // keyboard has no business following it there — least of all onto the
+    // calendar manager, which the picker can hand off to. The form's own field
+    // keeps its text; only focus and the IME go.
+    LaunchedEffect(showCalendarPicker) {
+        if (showCalendarPicker) {
+            focusManager.clearFocus(force = true)
+            keyboardController?.hide()
+        }
+    }
+
     if (showCalendarPicker) {
         CalendarPicker(
             calendars = state.calendars,