Change model sorting to natural order (#582)

Use natural sorting for model names.

Previously the model list was sorted lexicographically, which resulted
in unintuitive ordering when numbers were included in the name.

Example:

Before
qwen3.5:2B
qwen3.5:35B-3AB
qwen3.5:9B

After
qwen3.5:2B
qwen3.5:9B
qwen3.5:35B-3AB

This change sorts models using natural order so numeric parts are
compared numerically.

ui-svelte/src/stores/api.ts

@@ -62,7 +62,7 @@ export function enableAPIEvents(enabled: boolean): void {
             const newModels = JSON.parse(message.data) as Model[];
             // Sort models by name and id
             newModels.sort((a, b) => {
-              return (a.name + a.id).localeCompare(b.name + b.id);
+              return (a.name + a.id).localeCompare(b.name + b.id, undefined, { numeric : true} );
             });
             models.set(newModels);
             break;