feat(eo): complete EO simulation flow (T1 + T3) with Gemini transcription

- Gemini batch transcription (no Deepgram live)
- blobToBase64 helper (shared/lib/audio.ts)
- AudioRecorder: remove onChunk, add maxSeconds/onMaxReached auto-submit
- Timer stops at maxSeconds and triggers auto-submission
- EnregistrementEOPage: audioBase64 to backend, fix race condition step=done
- SimulationFlowProvider: submitEoAudio(audioBase64, mimeType, nclcCible)
- MIME normalization (strip codec params)
- Split CORRECTION_EE_TIMEOUT_MS (60s) / CORRECTION_EO_TIMEOUT_MS (120s)
- PresentationGenereeT1Page: localStorage persistence

Typecheck: OK · Tests: 159/159 ✅

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/entities/presentation/api.ts

@@ -0,0 +1,23 @@
+/**
+ * Appels API du domaine `presentation` — Sprint 4c-2.
+ *
+ * `POST /presentations/generate` : timeout 25 s (DeepSeek peut mettre 10-20 s),
+ * retry désactivé volontairement — un POST non-idempotent qui consomme un
+ * appel DeepSeek ne doit pas être rejoué silencieusement sur erreur réseau.
+ */
+
+import { apiFetch } from '@/shared/lib/api-client'
+import type { PresentationGenerated, PresentationReponses } from './types'
+
+const GENERATE_TIMEOUT_MS = 25_000
+
+export function generatePresentation(
+  reponses: PresentationReponses,
+): Promise<PresentationGenerated> {
+  return apiFetch<PresentationGenerated>('/presentations/generate', {
+    method: 'POST',
+    body: { reponses },
+    timeoutMs: GENERATE_TIMEOUT_MS,
+    retry: { max: 0, baseDelayMs: 0 },
+  })
+}