fix: use HF-supported share and favicon paths

Set the Space card thumbnail in README frontmatter and point Gradio's favicon path at the branded SVG asset.

README.md

@@ -9,6 +9,7 @@ app_file: app.py
 pinned: false
 license: apache-2.0
 short_description: "CPU-first technical companion for Slipstream 3.1.1"
+thumbnail: "https://huggingface.co/spaces/anthonym21/slipcore/raw/main/assets/slipstream-social-card.svg"
 ---
 
 # Slipstream Lab

app.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from pathlib import Path
 from typing import Any
 
 import gradio as gr
@@ -27,6 +28,7 @@ GUIDANCE_TOPICS = [
     "What model artifacts exist?",
     "How should I evaluate first?",
 ]
+FAVICON_PATH = Path(__file__).resolve().parent / "assets" / "slipstream-mark.svg"
 
 CUSTOM_CSS = """
 :root {
@@ -420,4 +422,5 @@ if __name__ == "__main__":
         ),
         css=CUSTOM_CSS,
         head=get_head_html(),
+        favicon_path=FAVICON_PATH,
     )