Add 3in logo file and aggressively fix desktop centering

- Add 3in par-ity project horizontal logo.png to repository
- Apply aggressive flexbox centering to all containers
- Remove all Streamlit default top padding and margins
- Force center alignment on element containers and blocks
- Reduce container padding-top to 0.5rem for minimal spacing
- Ensure logo is perfectly centered on desktop and mobile

app/streamlit_app.py

@@ -647,8 +647,9 @@ def main():
     
     /* Remove all default Streamlit spacing around logo */
     .main .block-container {
-        padding-top: 1rem !important;
+        padding-top: 0.5rem !important;
         padding-bottom: 0rem !important;
+        max-width: 100% !important;
     }
     
     /* Eliminate column spacing */
@@ -679,6 +680,29 @@ def main():
         margin-top: 0 !important;
     }
     
+    /* Force center alignment for all containers */
+    .element-container, .stVerticalBlock, .stHorizontalBlock {
+        display: flex !important;
+        justify-content: center !important;
+        align-items: center !important;
+        text-align: center !important;
+        width: 100% !important;
+    }
+    
+    /* Remove Streamlit's default top padding entirely */
+    .appview-container .main .block-container {
+        padding-top: 0 !important;
+        margin-top: 0 !important;
+    }
+    
+    /* Ensure the entire app container centers content */
+    .main {
+        display: flex !important;
+        flex-direction: column !important;
+        align-items: center !important;
+        justify-content: flex-start !important;
+    }
+    
 
     
 
@@ -757,7 +781,7 @@ def main():
     """, unsafe_allow_html=True)
     
     # Centered logo at the top - minimal spacing
-    st.markdown('<div style="text-align: center; width: 100%;">', unsafe_allow_html=True)
+    st.markdown('<div style="text-align: center; width: 100%; margin: 0; padding: 0; display: flex; justify-content: center; align-items: center;">', unsafe_allow_html=True)
     try:
         # Try multiple possible paths for the logo file
         logo_paths = [