feat(pm): add IFR arrival scenarios to the chooser

Adds the IFR arrival to the PM scenario picker:
- Complete chain "IFR Arrival" (Enroute → Approach → Landing → Taxi-in),
  starting at ifr-enroute-arrival-v1.
- Individual phases: Enroute Descent, IFR Approach, IFR Landing
  (taxi-in already present). All use the arrival airport for frequencies.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/pages/pm.vue

@@ -1798,6 +1798,17 @@ const SCENARIOS: Scenario[] = [
     noChain: false,
     airport: 'arr',
   },
+  {
+    id: 'ifr-arrival',
+    name: 'IFR Arrival',
+    subtitle: 'Enroute → Approach → Landing → Taxi-in',
+    chain: 'ifr-enroute-arrival-v1 → ifr-arrival-v1 → ifr-tower-landing-v1 → taxi-in-v1',
+    icon: 'mdi-airplane-landing',
+    startFlow: 'ifr-enroute-arrival-v1',
+    isComplete: true,
+    noChain: false,
+    airport: 'arr',
+  },
   // ── Individual phases ────────────────────────────────────────────────────
   {
     id: 'clearance',
@@ -1865,6 +1876,39 @@ const SCENARIOS: Scenario[] = [
     noChain: true,
     airport: 'arr',
   },
+  {
+    id: 'ifr-enroute',
+    name: 'Enroute Descent',
+    subtitle: 'Area Control stepped descent',
+    chain: 'ifr-enroute-arrival-v1',
+    icon: 'mdi-arrow-down-bold-circle-outline',
+    startFlow: 'ifr-enroute-arrival-v1',
+    isComplete: false,
+    noChain: true,
+    airport: 'arr',
+  },
+  {
+    id: 'ifr-approach',
+    name: 'IFR Approach',
+    subtitle: 'STAR, vectors & ILS',
+    chain: 'ifr-arrival-v1',
+    icon: 'mdi-radar',
+    startFlow: 'ifr-arrival-v1',
+    isComplete: false,
+    noChain: true,
+    airport: 'arr',
+  },
+  {
+    id: 'ifr-landing',
+    name: 'IFR Landing',
+    subtitle: 'Established, land and vacate',
+    chain: 'ifr-tower-landing-v1',
+    icon: 'mdi-airport',
+    startFlow: 'ifr-tower-landing-v1',
+    isComplete: false,
+    noChain: true,
+    airport: 'arr',
+  },
   {
     id: 'taxi-in',
     name: 'Taxi-in',