FIX: NAV-150 - Wait for static logo to load before starting app

- Avoids missing of logo.

public_transit_viewer/main.py

@@ -9,9 +9,12 @@
     time_form_row,
 )
 from public_transit_viewer.connection import output_connection
+from public_transit_viewer.utils import wait_for_logo_to_load
 
 connections: list[Connection] | None = None
 
+wait_for_logo_to_load(LOGO_PATH)
+
 st.set_page_config(
     page_title="Naviqore - Router",
     page_icon=str(LOGO_PATH),

public_transit_viewer/utils.py

@@ -1,5 +1,17 @@
+import time
+from pathlib import Path
+
 import matplotlib.colors as m_colors
 import matplotlib.pyplot as plt
+import streamlit as st
+
+
+def wait_for_logo_to_load(logo_path: Path, retries: int = 3, delay: int = 1):
+    for _ in range(retries):
+        if logo_path.exists():
+            return
+        time.sleep(delay)
+    st.error("Logo not found")
 
 
 def get_color_map_hex_value(