diff --git a/app/components/atc/TransmissionCard.vue b/app/components/atc/TransmissionCard.vue
index 9a0dc49..ad38909 100644
--- a/app/components/atc/TransmissionCard.vue
+++ b/app/components/atc/TransmissionCard.vue
@@ -162,26 +162,7 @@
 
 <script setup lang="ts">
 import { ref, computed, onMounted } from 'vue'
-
-interface TransmissionDebug {
-  sttRaw?: string
-  llmRequest?: { currentPhase: string; currentInteraction: string; pilotSaid: string; candidates: { id: string; intent: string }[]; contextSent: unknown }
-  llmResponse?: { chosenInteraction: string; confidence: 'high' | 'medium' | 'low'; reason: string; tokensUsed: number; durationMs: number; model: string }
-  engineAction?: { templateUsed: string; variablesUpdated: Record<string, unknown>; handoff?: { from: string; to: string }; phaseChanged?: { from: string; to: string } }
-  telemetryTrigger?: { parameter: string; condition: string; value: unknown }
-  readbackResult?: { complete: boolean; missing?: string[] }
-}
-
-interface Transmission {
-  id: string
-  timestamp: Date
-  speaker: 'pilot' | 'atc' | 'system'
-  message: string
-  normalized?: string
-  phase: string
-  frequency: string
-  debug: TransmissionDebug
-}
+import type { Transmission, TransmissionDebug } from '~~/shared/atc/types'
 
 const props = defineProps<{ transmission: Transmission }>()
 
diff --git a/app/pages/liveatc.vue b/app/pages/liveatc.vue
index e951909..1248a7c 100644
--- a/app/pages/liveatc.vue
+++ b/app/pages/liveatc.vue
@@ -180,9 +180,9 @@
 
 <script setup lang="ts">
 import { ref, computed, watch, nextTick, onMounted, onUnmounted } from 'vue'
-import { useAtcEngine } from '~/shared/atc/engine'
-import { getPhaseOrder, getPhase } from '~/shared/atc/phases'
-import type { Transmission, FlightPlan } from '~/shared/atc/types'
+import { useAtcEngine } from '~~/shared/atc/engine'
+import { getPhaseOrder, getPhase } from '~~/shared/atc/phases'
+import type { Transmission, FlightPlan } from '~~/shared/atc/types'
 
 // For radio effects (conditional import)
 let applyRadioEffect: ((audioBuffer: AudioBuffer, ctx: AudioContext, level: number) => AudioBuffer) | null = null
@@ -248,8 +248,8 @@ const standbyUnit = computed(() => {
 })
 
 // ── Transmissions ──
-const reversedTransmissions = computed(() =>
-  [...engine.state.transmissions].reverse()
+const reversedTransmissions = computed<Transmission[]>(() =>
+  ([...engine.state.transmissions] as Transmission[]).reverse()
 )
 
 const latestAtcTx = computed<Transmission | undefined>(() =>
@@ -337,7 +337,7 @@ async function handleRecordingComplete(payload: { audio: string; format: string
       phase: engine.state.currentPhase,
       frequency: engine.currentPhase.value?.frequency ?? '',
       debug: {},
-    })
+    } as any)
   } finally {
     processing.value = false
   }
diff --git a/server/api/atc/route.post.ts b/server/api/atc/route.post.ts
index d9970b5..c6e761c 100644
--- a/server/api/atc/route.post.ts
+++ b/server/api/atc/route.post.ts
@@ -104,7 +104,7 @@ function heuristicReadbackCheck(
   // Clearly good readback (>= 70% of values present)
   if (ratio >= 0.7) {
     const readbackOk = candidates.find((c) => c.intent.toLowerCase().includes('correct') || c.id.includes('ok'))
-    const chosen = readbackOk || candidates[0]
+    const chosen = readbackOk ?? candidates[0]!
     return {
       chosen: chosen.id,
       reason: 'Heuristic: readback contains required values',
@@ -123,7 +123,7 @@ function heuristicReadbackCheck(
   // Clearly bad readback (< 30% of values present)
   if (ratio < 0.3 && valuesToCheck.length >= 2) {
     const readbackBad = candidates.find((c) => c.intent.toLowerCase().includes('incorrect') || c.id.includes('bad'))
-    const chosen = readbackBad || candidates[0]
+    const chosen = readbackBad ?? candidates[0]!
     return {
       chosen: chosen.id,
       reason: 'Heuristic: readback missing most required values',
@@ -160,10 +160,11 @@ export default defineEventHandler(async (event): Promise<RouteResponse> => {
 
   // ── Fast path: single candidate → auto-select ──
   if (body.candidates.length === 1) {
+    const single = body.candidates[0]!
     return {
-      chosen: body.candidates[0].id,
+      chosen: single.id,
       reason: 'Only one candidate available',
-      pilotIntent: body.candidates[0].intent,
+      pilotIntent: single.intent,
       confidence: 'high',
       tokensUsed: 0,
       durationMs: Date.now() - startMs,
@@ -207,8 +208,7 @@ export default defineEventHandler(async (event): Promise<RouteResponse> => {
       ],
       temperature: 0.1,
       max_tokens: 150,
-      // @ts-expect-error -- reasoning_effort supported by OpenAI API but not yet in all type defs
-      reasoning_effort: 'low',
+      reasoning_effort: 'low' as any,
     })
 
     const durationMs = Date.now() - startMs
@@ -224,7 +224,7 @@ export default defineEventHandler(async (event): Promise<RouteResponse> => {
         parsed.chosen === 'off_schema' || body.candidates.some((c) => c.id === parsed.chosen)
 
       return {
-        chosen: validId ? parsed.chosen : body.candidates[0].id,
+        chosen: validId ? parsed.chosen : body.candidates[0]!.id,
         reason: String(parsed.reason || 'LLM selected'),
         pilotIntent: String(parsed.pilotIntent || body.pilotSaid),
         confidence: validId ? validateConfidence(parsed.confidence) : 'low',
@@ -237,7 +237,7 @@ export default defineEventHandler(async (event): Promise<RouteResponse> => {
     // Malformed JSON fallback
     console.warn('[route.post] LLM returned malformed JSON, falling back to first candidate:', rawContent)
     return {
-      chosen: body.candidates[0].id,
+      chosen: body.candidates[0]!.id,
       reason: 'LLM response was malformed, defaulting to first candidate',
       pilotIntent: body.pilotSaid,
       confidence: 'low',