feat: refactor document URL retrieval for atestados and licencas

- Updated the document URL fetching logic in the +page.svelte file to use a new query method, enhancing the retrieval process.
- Added a new query in atestadosLicencas.ts to obtain stored document URLs, improving authentication checks and error handling.
- Streamlined the user experience by ensuring URLs are fetched correctly and opened in a new tab when available.

packages/backend/convex/atestadosLicencas.ts

@@ -740,6 +740,22 @@ export const generateUploadUrl = mutation({
   },
 });
 
+/**
+ * Obter URL de um documento armazenado
+ */
+export const obterUrlDocumento = query({
+  args: {
+    storageId: v.id("_storage"),
+  },
+  returns: v.union(v.string(), v.null()),
+  handler: async (ctx, args) => {
+    const usuario = await getUsuarioAutenticado(ctx);
+    if (!usuario) throw new Error("Não autenticado");
+
+    return await ctx.storage.getUrl(args.storageId);
+  },
+});
+
 /**
  * Criar atestado médico
  */