feat: add SVG logo and update UI layout

.gitignore

@@ -14,6 +14,7 @@ temp_character_*.json
 
 # Generated images (if they should be ignored)
 *.png
+!assets/
 !comfy_workflow_visual.png # Exception example if needed
 
 # OS generated files

modules/ui_layout.py

@@ -12,7 +12,7 @@ from .name_generator import generate_fantasy_name
 def build_ui():
     with gr.Blocks(title="Chronicle Portrait Studio") as demo:
         with gr.Row(variant="compact"):
-            gr.Image("assets/header_background.png", show_label=False, container=False, interactive=False, height=120)
+            gr.Image("assets/logo.svg", show_label=False, container=False, interactive=False, height=120)
         
         gr.Markdown("# ⚔️ Chronicle Portrait Studio")
         gr.Markdown("Craft legendary AI-powered portraits for your RPG adventures.")