Session 2026-04-19: Navigation, Kompass, Übungsfortschritt

Routen-Navigation:
- POI-Marker: farbige Kreise mit Phosphor-Icons (wie Hauptkarte)
- Screensaver: Navi-Pfeil dreht sich via DeviceOrientationEvent (iOS+Android)
- Pfeil-Dämpfung: EMA α=0.12 mit Wrap-Around
- GPS-Distanz-Bug: Fortschritt nur wenn <500m zur Route
- fitBounds: User-Position nur wenn <20km von Route
- Screensaver: "zur Route" vs "verbleibend" kontextabhängig
- Richtungspfeile entlang Route (blau, max 7 Stück)
- Umkehren ins Route-Detail verschoben, Detail-Map rebuildet sich
- rk-header z-index:10 (Leaflet-Tiles liefen drüber)
- 2-Sek. Screensaver-Entsperrung

km-Tracking:
- route_walks Tabelle
- POST /api/routes/{id}/walked (≥50%)
- total_km = erstellte Routes + gelaufene route_walks
- Toast bei neuem Badge

Übungsfortschritt:
- exercise_progress + training_plan_progress Tabellen
- GET/POST /api/training/progress, /plan-progress, /suggestions
- uebungen.js: API-first + localStorage-Fallback + Auto-Migration
- Empfehlungs-Banner (regelbasiert)
- Toast bei "sitzt"

backend/routes/diary.py

@@ -449,6 +449,8 @@ async def delete_diary(dog_id: int, entry_id: int, user=Depends(get_current_user
 
 def _guess_media_type(content_type: str, filename: str) -> str:
     ct = (content_type or "").lower()
+    if ct == "application/pdf" or (filename or "").lower().endswith(".pdf"):
+        return "pdf"
     if ct.startswith("video/"):
         return "video"
     ext = os.path.splitext(filename or "")[1].lower()
@@ -475,13 +477,14 @@ async def upload_media(dog_id: int, entry_id: int,
     ALLOWED = {
         "image/jpeg", "image/png", "image/gif", "image/webp", "image/heic", "image/heif",
         "video/mp4", "video/quicktime", "video/webm", "video/x-m4v",
+        "application/pdf",
     }
     ct = file.content_type or ""
     if ct not in ALLOWED:
         ext_low = os.path.splitext(file.filename or "")[1].lower()
         if ext_low not in {".jpg",".jpeg",".png",".gif",".webp",".heic",".heif",
-                           ".mp4",".mov",".webm",".m4v"}:
-            raise HTTPException(415, "Nur Bilder und Videos erlaubt.")
+                           ".mp4",".mov",".webm",".m4v",".pdf"}:
+            raise HTTPException(415, "Nur Bilder, Videos und PDFs erlaubt.")
 
     ext        = os.path.splitext(file.filename or "")[1] or ".jpg"
     filename   = f"diary_{entry_id}_{uuid.uuid4().hex[:8]}{ext}"