feat(live-atc): manual flight entry on setup screen

Adds a "Manual flight" card alongside VATSIM and demo so a flight can
be entered by hand (callsign, dep, arr, optional aircraft/altitude)
without a VATSIM account. Feeds into the same scenario picker.

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

app/components/live-atc/FlightSourceStep.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import { reactive, computed } from 'vue'
 import SetupCard from '~/components/live-atc/SetupCard.vue'
 
 defineProps<{
@@ -8,10 +9,36 @@ defineProps<{
 
 const vatsimId = defineModel<string>('vatsimId', { required: true })
 
-defineEmits<{
+const emit = defineEmits<{
   (e: 'load-flight-plans'): void
   (e: 'start-demo'): void
+  (e: 'start-manual', plan: { callsign: string; dep: string; arr: string; aircraft: string; altitude: string }): void
 }>()
+
+const manual = reactive({
+  callsign: '',
+  dep: '',
+  arr: '',
+  aircraft: '',
+  altitude: '',
+})
+
+const manualValid = computed(() =>
+  manual.callsign.trim().length >= 2 &&
+  manual.dep.trim().length >= 3 &&
+  manual.arr.trim().length >= 3
+)
+
+const startManual = () => {
+  if (!manualValid.value) return
+  emit('start-manual', {
+    callsign: manual.callsign,
+    dep: manual.dep,
+    arr: manual.arr,
+    aircraft: manual.aircraft,
+    altitude: manual.altitude,
+  })
+}
 </script>
 
 <template>
@@ -53,6 +80,85 @@ defineEmits<{
       </div>
     </SetupCard>
 
+    <!-- Manual flight entry -->
+    <SetupCard>
+      <div class="space-y-4">
+        <div>
+          <h2 class="text-lg font-semibold">Manual flight</h2>
+          <p class="text-sm text-[var(--t3)]">Enter a flight by hand — no VATSIM account needed.</p>
+        </div>
+        <v-text-field
+            v-model="manual.callsign"
+            label="Callsign"
+            placeholder="DLH39A"
+            variant="outlined"
+            density="comfortable"
+            color="cyan"
+            prepend-inner-icon="mdi-radio-tower"
+            hide-details
+            @keyup.enter="startManual"
+        />
+        <div class="grid grid-cols-2 gap-3">
+          <v-text-field
+              v-model="manual.dep"
+              label="From (ICAO)"
+              placeholder="EDDF"
+              variant="outlined"
+              density="comfortable"
+              color="cyan"
+              prepend-inner-icon="mdi-airplane-takeoff"
+              maxlength="4"
+              hide-details
+              @keyup.enter="startManual"
+          />
+          <v-text-field
+              v-model="manual.arr"
+              label="To (ICAO)"
+              placeholder="EDDM"
+              variant="outlined"
+              density="comfortable"
+              color="cyan"
+              prepend-inner-icon="mdi-airplane-landing"
+              maxlength="4"
+              hide-details
+              @keyup.enter="startManual"
+          />
+        </div>
+        <div class="grid grid-cols-2 gap-3">
+          <v-text-field
+              v-model="manual.aircraft"
+              label="Aircraft (opt.)"
+              placeholder="A320/L"
+              variant="outlined"
+              density="comfortable"
+              color="cyan"
+              prepend-inner-icon="mdi-airplane"
+              hide-details
+          />
+          <v-text-field
+              v-model="manual.altitude"
+              label="Cruise ft (opt.)"
+              placeholder="36000"
+              variant="outlined"
+              density="comfortable"
+              color="cyan"
+              prepend-inner-icon="mdi-arrow-expand-vertical"
+              inputmode="numeric"
+              hide-details
+          />
+        </div>
+        <v-btn
+            block
+            color="cyan"
+            variant="tonal"
+            :disabled="!manualValid"
+            @click="startManual"
+        >
+          Continue with this flight
+        </v-btn>
+      </div>
+    </SetupCard>
+
     <!-- Demo Mode -->
     <SetupCard>
       <div class="space-y-4">