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/components/forms/notifications/CreateNotification.tsx

@@ -100,7 +100,7 @@ const CreateNotificationForm = () => {
             {...register("link", {
               pattern: {
                 value: REGEX.URL,
-                message: FormErrorMessages.invalidPattern,
+                message: FormErrorMessages.invalidPattern, 
               },
             })}
             name="link"