Fixes two Svelte 5 issues (#68)

- Svelte 5 disallows bindings with fallbacks (sveltejs/svelte#9764)
- Conflict due to new Svelte 5 syntax with "$" name

Author: lfrancke

src/lib/components/crud/cells/Boolean.svelte

@@ -10,7 +10,7 @@
   let {
     rowspan = 1,
     colspan = 1,
-    value = $bindable(false),
+    value = $bindable(),
     labelFalse = 'False',
     labelTrue = 'True'
   }: Props = $props();

src/lib/components/crud/cells/SelectFeature.svelte

@@ -11,8 +11,8 @@
 
   let input: HTMLInputElement;
   let filter = '';
-  $: filteredFeaturesWithParents = derived(featuresWithParents, ($) => {
-    return $.filter((feature) => {
+  $: filteredFeaturesWithParents = derived(featuresWithParents, (features) => {
+    return features.filter((feature) => {
       return feature.name.toLowerCase().includes(filter.toLowerCase());
     });
   });