feat(webDev): add inquiry modal for pricing plans

This commit introduces a 'Contact Sales' modal on the web development page, allowing users to inquire about specific service plans.

- The pricing plan buttons now trigger this modal, pre-filled with the selected plan's details.
- Users can add custom remarks to their inquiry.
- On submission, a pre-formatted message is generated and opened in WhatsApp using a new `useWhatsAppMsgSender` composable.
- Adds `NUXT_PUBLIC_WHATSAPP_NUMBER` to the runtime configuration.
- Refactors content validation by introducing Zod schemas for `PricingPlan` and `Button` props to improve type safety.
- Adds new i18n keys for the modal interface and message templates.

app/schemas/buttonSchema.ts

@@ -0,0 +1,37 @@
+// buttonSchema.ts
+import { z } from "zod";
+
+const ButtonSize = z.enum(["2xs", "xs", "sm", "md", "lg", "xl"]);
+const ButtonColor = z.enum([
+  "error",
+  "primary",
+  "secondary",
+  "success",
+  "info",
+  "warning",
+  "neutral",
+]);
+const ButtonVariant = z.enum(["solid", "outline", "soft", "ghost", "link"]);
+
+export const ButtonPropsSchema = z.object({
+  size: ButtonSize.optional().default("sm"),
+  type: z.enum(["button", "submit", "reset"]).optional().default("button"),
+  label: z.string().optional().default(""),
+  color: ButtonColor.optional().default("primary"),
+  variant: ButtonVariant.optional().default("solid"),
+  icon: z.string().optional().default(""),
+  leading: z.boolean().optional().default(false),
+  trailing: z.boolean().optional().default(false),
+  disabled: z.boolean().optional().default(false),
+  loading: z.boolean().optional().default(false),
+  loadingIcon: z.string().optional().default("i-heroicons-arrow-path-20-solid"),
+  block: z.boolean().optional().default(false),
+  to: z.string().optional().default(""),
+  target: z.string().optional().default(""),
+  padded: z.boolean().optional().default(true),
+  square: z.boolean().optional().default(false),
+  truncate: z.boolean().optional().default(false),
+  attrs: z.record(z.any()).optional().default({}),
+});
+
+export type ButtonProps = z.infer<typeof ButtonPropsSchema>;