Allow creating backups without library entries

- In case you want a backup of just settings?
- Also disable backup options if dependent option is disabled (and fix being able to toggle disabled items)
- Also fix crash in RestoreBackupScreen due to attempt to parcelize Uri
- Make restore validation message a bit nicer

presentation-core/src/main/java/tachiyomi/presentation/core/components/LabeledCheckbox.kt

@@ -31,7 +31,11 @@ fun LabeledCheckbox(
             .heightIn(min = 48.dp)
             .clickable(
                 role = Role.Checkbox,
-                onClick = { onCheckedChange(!checked) },
+                onClick = {
+                    if (enabled) {
+                        onCheckedChange(!checked)
+                    }
+                },
             ),
         verticalAlignment = Alignment.CenterVertically,
         horizontalArrangement = Arrangement.spacedBy(MaterialTheme.padding.small),