fix: static dir path resolution

when running in different environments, the static_path is different.
This path is now 'determined' at runtime

backend/apps/webui/routers/utils.py

+from pathlib import Path
+import site
+
 from fastapi import APIRouter, UploadFile, File, Response
 from fastapi import Depends, HTTPException, status
 from starlette.responses import StreamingResponse, FileResponse
@@ -64,8 +67,18 @@ async def download_chat_as_pdf(
     pdf = FPDF()
     pdf.add_page()
 
-    STATIC_DIR = "./static"
-    FONTS_DIR = f"{STATIC_DIR}/fonts"
+    # When running in docker, workdir is /app/backend, so fonts is in /app/backend/static/fonts
+    FONTS_DIR = Path("./static/fonts")
+
+    # Non Docker Installation
+
+    # When running using `pip install` the static directory is in the site packages.
+    if not FONTS_DIR.exists():
+        FONTS_DIR = Path(site.getsitepackages()[0]) / "static/fonts"
+    # When running using `pip install -e .` the static directory is in the site packages.
+    # This path only works if `open-webui serve` is run from the root of this project.
+    if not FONTS_DIR.exists():
+        FONTS_DIR = Path("./backend/static/fonts")
 
     pdf.add_font("NotoSans", "", f"{FONTS_DIR}/NotoSans-Regular.ttf")
     pdf.add_font("NotoSans", "b", f"{FONTS_DIR}/NotoSans-Bold.ttf")