Retranscribe feature: ponovi STT z drugim providerjem v Edit modalu

PROBLEM: STT (Soniox/Scribe) včasih popolnoma narobe slišije besedilo —
npr. 'BILA JE LJUBEZEN PRVA' postane 'BILAL JO ME ZANPRLA' (TRIO ŠUBIC).
Edit modal je do zdaj zahteval popoln recut z novim clip range.

NEW: '🔁 Ponovi transkript' gumb v Edit modalu z dropdown za provider:
  - Scribe (ElevenLabs) — default, najboljši za nemščino + slovenščino
  - Soniox — slovenski default v auto routing
  - Whisper local (faster-whisper)

Backend:
  POST /api/jobs/{id}/retranscribe { provider, auto_upload?, lang? }
  - Briše stari MP4 + analysis.json + .srt + .ass (lokal + S3)
  - Re-queue job z whisper_provider override
  - Ohrani isti clip range — analyze.py si naredi svežo analizo
  - retranscribe_count števec za sledenje poskusov

UX: confirm dialog → 1.5s status → auto-close modal → watchJob za live progress.
Brez auto_upload v Nextcloud — preveri rezultat preden re-uploadaš.

app/main.py

@@ -2435,6 +2435,86 @@ async def recut_job(job_id: str, payload: RecutRequest, user: str = Depends(chec
     }
 
 
+# ────────────────────────────────────────────────────────────────
+# Retranscribe — ponovi STT z drugim providerjem (npr. Soniox→Scribe)
+# Ohrani isti clip range, samo regenerira transkript + podnapise + render.
+# ────────────────────────────────────────────────────────────────
+class RetranscribeRequest(BaseModel):
+    provider: str = "elevenlabs"  # 'elevenlabs' (Scribe) | 'local' (faster-whisper) | 'soniox' | 'auto'
+    lang: Optional[str] = None    # ostane original če None
+    auto_upload: bool = False     # po končanem renderu naloži v Nextcloud (overwrites obstoječ)
+
+
+@app.post("/api/jobs/{job_id}/retranscribe")
+async def retranscribe_job(job_id: str, payload: RetranscribeRequest, user: str = Depends(check_auth)):
+    """Ponovi transkripcijo z drugim STT providerjem in re-renderaj.
+    
+    Ohrani isti clip range (start/end iz obstoječe analize) — uporabnik
+    ne potrebuje ponovno pozicionirati IN/OUT. Samo besedilo se popravi.
+    
+    Pogosto: Soniox je narobe slišal v slovenskem folkloru, gremo na Scribe.
+    """
+    job = load_job(job_id)
+    if not job:
+        raise HTTPException(404, "Ne obstaja")
+    if job.get("status") in ("queued", "processing", "downloading"):
+        raise HTTPException(409, "Job je že v obdelavi")
+    
+    # Validate provider
+    valid_providers = {"elevenlabs", "local", "soniox", "auto"}
+    if payload.provider not in valid_providers:
+        raise HTTPException(400, f"Neveljaven provider. Dovoljen: {sorted(valid_providers)}")
+    
+    # Original input mora obstajati (lokalno ali v S3)
+    src = job.get("input_path")
+    if not src:
+        raise HTTPException(400, "Original video manjka")
+    _ensure_local(src, "upload")
+    if not Path(src).exists():
+        raise HTTPException(400, "Original video ne obstaja niti lokalno niti v S3")
+    
+    # Briši stari output + analysis (ker bo regen)
+    out_mp4 = OUTPUT_DIR / f"{job_id}.mp4"
+    if out_mp4.exists():
+        out_mp4.unlink()
+        _delete_from_s3(out_mp4.name, "output")
+    for ext in ("srt", "ass"):
+        p = OUTPUT_DIR / f"{job_id}.subtitles.{ext}"
+        if p.exists():
+            p.unlink()
+            _delete_from_s3(p.name, "output")
+    # Briši tudi analysis.json — zaženemo svežo analizo
+    analysis_path = OUTPUT_DIR / f"{job_id}.analysis.json"
+    if analysis_path.exists():
+        analysis_path.unlink()
+        _delete_from_s3(analysis_path.name, "output")
+    
+    # Re-queue job — pomembno: NE postavi custom_clip=True (pustimo polno re-analizo)
+    # whisper_provider override poskrbi, da bo tokrat drug STT
+    updates = {
+        "status": "queued",
+        "current_step": f"V vrsti za retranscribe ({payload.provider})",
+        "whisper_provider": payload.provider,
+        "auto_upload_to_nextcloud": payload.auto_upload,
+        "hidden_after_upload": False,
+        "nextcloud_status": "retranscribing",
+        "error": None,
+        "chorus_error": None,
+        "custom_clip": False,
+        "retranscribe_count": (job.get("retranscribe_count", 0) or 0) + 1,
+    }
+    if payload.lang and payload.lang not in ("auto", ""):
+        updates["lang"] = payload.lang
+    update_job(job_id, **updates)
+    
+    return {
+        "status": "queued",
+        "job_id": job_id,
+        "provider": payload.provider,
+        "retranscribe_count": updates["retranscribe_count"],
+    }
+
+
 # ────────────────────────────────────────────────────────────────
 # Nextcloud upload (folxspeed/REELS/)
 # ────────────────────────────────────────────────────────────────