Redesign mobile time clock, add shortcuts, and improve account management.

Add iOS Shortcuts/Siri intents, local send-reminder notifications, stable
client picker with last-client defaults, account refresh/remove, and softer
session handling on unauthorized API responses.

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

lib/time-clock.ts

@@ -25,6 +25,20 @@ export function formatElapsedHoursMinutes(seconds: number): string {
   return `${h}:${String(m).padStart(2, "0")}`;
 }
 
+export function resolveEffectiveHourlyRate(
+  rateText: string,
+  clientDefaultRate?: number | null,
+): number | null {
+  const parsed = rateText.trim() ? Number(rateText) : null;
+  if (parsed != null && !Number.isNaN(parsed) && parsed >= 0) return parsed;
+  if (clientDefaultRate != null && clientDefaultRate >= 0) return clientDefaultRate;
+  return null;
+}
+
+export function startedAtFromMinutesAgo(minutes: number): Date {
+  return new Date(Date.now() - minutes * 60_000);
+}
+
 export function describeClockOutOutcome(input: {
   outcome: ClockOutOutcome;
   hours: number;