fix(auth, customers): Refresh page on logout and rename form field

This commit introduces two main improvements: ensuring a clean state after user logout and enhancing the clarity of the customer creation form.

The logout function in the `UserContext` now calls `router.refresh()`. This forces a page reload, preventing the user from seeing stale, authenticated data after logging out.

Additionally, the form field for assigning companies to a customer has been renamed from `company_ids` to `companies` in both the form component and the Zod validation schema. This refactoring improves code clarity and consistency. A related `console.log` statement was also removed.

src/lib/api/types/Customers.ts

@@ -48,7 +48,7 @@ const createCustomerCredentials = z.object({
     .optional(),
   annual_revenue: z.number().min(0).max(999999999999).optional(),
   business_type: z.string().min(2).max(100).optional(),
-  company_ids: z.array(z.string()).optional(),
+  companies: z.array(z.string()).optional(),
   contact_person: z
     .object({
       email: z.string(),