Prevent accidental sheet dismissal via drag handle area

Material3 wraps the composable passed to ModalBottomSheet's dragHandle slot
in a Modifier.clickable that dismisses an expanded sheet. That clickable is
not covered by sheetGesturesEnabled, so tapping the empty space of the
header (next to the menu actions) closed sheets that explicitly disabled
gestures - Add Principal, Create Calendar, Update Principal Password and
Settings.

When gestures are disabled, render the header as ordinary sheet content and
pass no drag handle at all. The sheet then only closes through its menu
actions or by clicking the scrim outside of it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ACWMSLHFXaEukqSo5KyAF8

Author: claude

shared/src/commonMain/kotlin/at/techbee/spectacled/screens/core/presentation/components/BottomSheetWithMenu.kt

@@ -81,9 +81,17 @@ fun BottomSheetWithMenu(
     ModalBottomSheet(
         onDismissRequest = { onDismiss() },
         sheetState = sheetState,
-        dragHandle = header,
+        // Material3 wraps whatever is passed as dragHandle in a clickable that dismisses an
+        // expanded sheet - and that clickable is not covered by sheetGesturesEnabled. So when
+        // gestures are disabled the header is rendered as ordinary sheet content instead, and
+        // tapping the empty space next to the menu actions can no longer close the sheet by
+        // accident. The only ways out are then the menu actions and (on wide screens) the scrim.
+        dragHandle = if (gesturesEnabled) header else null,
         sheetGesturesEnabled = gesturesEnabled
     ) {
+        if (!gesturesEnabled)
+            header()
+
         Column(
             verticalArrangement = Arrangement.spacedBy(16.dp),
             horizontalAlignment = Alignment.CenterHorizontally,