feat(unit): implement unit management flow with list and form components

- Add schema validation and default query params for unit management
- Create list view with pagination, search, and delete functionality
- Implement form entry with validation for creating/editing units
- Replace placeholder content with functional unit list component
- Remove unused unit add page and update page titles

app/components/flow/unit/schema.query.ts

@@ -0,0 +1,15 @@
+import * as z from 'zod'
+
+export const querySchema = z.object({
+  q: z.union([z.literal(''), z.string().min(3)]).optional().catch(''),
+  page: z.coerce.number().int().min(1).default(1).catch(1),
+  pageSize: z.coerce.number().int().min(5).max(20).default(10).catch(10),
+})
+
+export const defaultQuery = {
+  q: '',
+  page: 1,
+  pageSize: 10,
+}
+
+export type QueryParams = z.infer<typeof querySchema>