Add WASM parser and Vue dissector UI.

Ship a working HexPigeon: typed binary parsing in Rust/WASM, a three-pane frontend, and unit tests covering the field types.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/utils/hex.ts

@@ -0,0 +1,17 @@
+/** Parse a hex dump string into byte values. Whitespace is ignored. */
+export function parseHexInput(hex: string): number[] {
+  const clean = hex.replace(/\s/g, '')
+  if (clean.length % 2 !== 0) return []
+  const out: number[] = []
+  for (let i = 0; i < clean.length; i += 2) {
+    const b = parseInt(clean.slice(i, i + 2), 16)
+    if (Number.isNaN(b)) return []
+    out.push(b)
+  }
+  return out
+}
+
+/** Format bytes as uppercase hex pairs separated by spaces. */
+export function formatHexBytes(bytes: number[]): string {
+  return bytes.map(b => b.toString(16).padStart(2, '0').toUpperCase()).join(' ')
+}