feat: major UI/UX overhaul + user management + ticket detail refactor

- 5-tab navigation (Home/Clients/Collect/Tickets/Profile)
- Inline styles throughout (17px min font, SafeAreaView)
- Dashboard fixed to match real API shape
- Ticket detail: 2 tabs (Details + Comments), always-visible comment input
- Installation confirmation: GPS coordinate capture + client location update
- User management screens (Admin only): list, create, detail + role/active toggle
- Tasks folder replaces tickets folder
- Remittance detail: inline styles
- Record payment: prefill from client, live button text
- Icon component with SVG icons
- Color system: primary #0891B2

app/(app)/users/_layout.tsx

@@ -0,0 +1,4 @@
+import { Stack } from 'expo-router';
+export default function UsersLayout() {
+  return <Stack screenOptions={{ headerShown: false }} />;
+}