fix: Prevent edit page crash and correct date formatting

On the company edit page, added optional chaining to the `defaultValues` prop. This prevents a potential runtime error if the company data is undefined when the page loads.

Additionally, this commit corrects the `unixToDate` utility function. The previous logic could incorrectly include 'false' in the format string when time was not required. It now uses a ternary operator to conditionally add the time format, ensuring correct output.

Minor code formatting adjustments are also included.

src/lib/api/services/companies-service.ts

@@ -128,7 +128,7 @@ export const companyCategoriesService = {
       throw error;
     }
   },
-   updateCategories: async ({
+  updateCategories: async ({
     id,
     credentials,
   }: {