feat: update postage stamp creation screen (#641)

* style: UI changes for postage stamp

* feat: New postage stamp standard page

---------

Co-authored-by: Seres Roland <seresroland@Seres-MBP.home>

src/utils/stamps.ts

@@ -0,0 +1,25 @@
+export function getStampUsage(utilization: number, depth: number, bucketDepth: number): number {
+  return utilization / Math.pow(2, depth - bucketDepth)
+}
+
+export function getStampMaximumCapacityBytes(depth: number): number {
+  return 2 ** depth * 4096
+}
+
+export function getStampCostInPlur(depth: number, amount: number): number {
+  return 2 ** depth * amount
+}
+
+export function getStampCostInBzz(depth: number, amount: number): number {
+  const BZZ_UNIT = 10 ** 16
+
+  return getStampCostInPlur(depth, amount) / BZZ_UNIT
+}
+
+// export function getStampTtlSeconds(amount: number, pricePerBlock = 24_000, blockTime = 5): number {
+//   return (amount * blockTime) / pricePerBlock
+// }
+
+export function getStampTtlSeconds(amount: number, pricePerBlock = 24_000, blockTime = 5): number {
+  return (amount * blockTime) / pricePerBlock
+}