fix(web): widen TrackMenuItem icon prop type to match Lucide signature

Previous fix narrowed `IconProp` to `ComponentType<SvelteComponent<{
size?: number, strokeWidth?: number, class?: string }>>` but Lucide
icons accept `size: string | number` (you can write size="16" or
size={16}), and the resulting structural mismatch surfaces 11 type
errors at every assignment site. Drop the prop-shape constraint
entirely — TrackMenuItem only ever passes numeric values to the icon.

web/src/lib/components/TrackMenuItem.svelte

@@ -3,10 +3,11 @@
 
   // Lucide-svelte ships class-based components (typeof ListPlus = ComponentType<...>),
   // not runes-mode function components (Svelte 5's Component<...> type). Use
-  // ComponentType<SvelteComponent<...>> so any Lucide icon assigns cleanly.
-  type IconProp = ComponentType<
-    SvelteComponent<{ size?: number; strokeWidth?: number; class?: string }>
-  >;
+  // ComponentType<SvelteComponent> with no prop-shape constraint — Lucide
+  // accepts size/strokeWidth as `string | number` and a tighter constraint
+  // here trips structural assignment. We always pass numeric `size={14}` and
+  // `strokeWidth={1}` below so the runtime contract is consistent.
+  type IconProp = ComponentType<SvelteComponent>;
 
   let {
     icon,