feat: add validation utilities

Author: wkalidev

src/utils/validation.ts

@@ -0,0 +1,18 @@
+export function isValidAddress(address: string): boolean {
+  return /^S[PM][0-9A-Z]{38,39}$/.test(address)
+}
+
+export function isPositiveNumber(value: string): boolean {
+  const n = parseFloat(value)
+  return !isNaN(n) && n > 0
+}
+
+export function isValidLockBlocks(blocks: number): boolean {
+  return [0, 525, 1050, 2100].includes(blocks)
+}
+
+export function validateStakeInput(amount: string, balance: number): string | null {
+  if (!isPositiveNumber(amount)) return 'Enter a valid amount'
+  if (parseFloat(amount) > balance) return 'Insufficient balance'
+  return null
+}