feat(driver-pwa): pure money/phone/amount helpers + tests

Co-Authored-By: claude-flow <ruv@ruv.net>

driver-pwa/frontend/src/lib/amount.test.ts

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+import { describe, it, expect } from "vitest";
+import { keypadReduce, withCommission } from "./amount";
+
+describe("amount keypad", () => {
+  it("appends digits, ignores leading zero, caps length", () => {
+    expect(keypadReduce("0", "5")).toBe("5");
+    expect(keypadReduce("100", "0")).toBe("1000");
+    expect(keypadReduce("", "0")).toBe("");
+    expect(keypadReduce("999999", "9")).toBe("999999");
+  });
+  it("backspace removes last digit", () => {
+    expect(keypadReduce("105", "back")).toBe("10");
+    expect(keypadReduce("", "back")).toBe("");
+  });
+  it("withCommission computes total at given rate", () => {
+    expect(withCommission(1000, 0.052)).toEqual({ commission: 52, total: 1052 });
+    expect(withCommission(333, 0.052)).toEqual({ commission: 17.32, total: 350.32 });
+  });
+});

driver-pwa/frontend/src/lib/amount.ts

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+const MAX_DIGITS = 6;
+
+export function keypadReduce(current: string, key: string): string {
+  if (key === "back") return current.slice(0, -1);
+  if (!/^\d$/.test(key)) return current;
+  if (current === "0") return key === "0" ? "0" : key;  // replace leading zero
+  if (current === "" && key === "0") return "";          // no leading zero from empty
+  if (current.length >= MAX_DIGITS) return current;
+  return current + key;
+}
+
+export function withCommission(base: number, rate: number): { commission: number; total: number } {
+  const commission = Math.round(base * rate * 100) / 100;
+  const total = Math.round((base + commission) * 100) / 100;
+  return { commission, total };
+}

driver-pwa/frontend/src/lib/format.test.ts

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+import { describe, it, expect } from "vitest";
+import { formatMoney, formatPhone, digitsOnly } from "./format";
+
+describe("format", () => {
+  it("formatMoney groups thousands and adds ₽", () => {
+    expect(formatMoney(1000)).toBe("1 000 ₽");
+    expect(formatMoney(-3200)).toBe("−3 200 ₽");
+    expect(formatMoney(0)).toBe("0 ₽");
+  });
+  it("digitsOnly strips non-digits", () => {
+    expect(digitsOnly("+7 (914) 305-44-00")).toBe("79143054400");
+  });
+  it("formatPhone renders +7 mask progressively", () => {
+    expect(formatPhone("9143054400")).toBe("+7 914 305-44-00");
+    expect(formatPhone("914305")).toBe("+7 914 305");
+  });
+});

driver-pwa/frontend/src/lib/format.ts

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+export function digitsOnly(s: string): string {
+  return (s || "").replace(/\D/g, "");
+}
+
+export function formatMoney(rub: number): string {
+  const neg = rub < 0;
+  const abs = Math.abs(Math.round(rub));
+  const grouped = abs.toString().replace(/\B(?=(\d{3})+(?!\d))/g, " ");
+  return `${neg ? "−" : ""}${grouped} ₽`;
+}
+
+/** Render a Russian mobile from up-to-10 national digits as +7 914 305-44-00. */
+export function formatPhone(national10: string): string {
+  const d = digitsOnly(national10).slice(0, 10);
+  const p: string[] = ["+7"];
+  if (d.length > 0) p.push(" " + d.slice(0, 3));
+  if (d.length > 3) p.push(" " + d.slice(3, 6));
+  if (d.length > 6) p.push("-" + d.slice(6, 8));
+  if (d.length > 8) p.push("-" + d.slice(8, 10));
+  return p.join("");
+}