feat: Add Gemini attribution header to all AI-generated insights

- Created get_gemini_header() helper function with Gemini logo and branding
- Added header to leaderboard insights (generate_insights)
- Added header to trace debugging Q&A (ask_about_trace)
- Added header to run comparison insights (generate_ai_comparison)
- Added header to run analysis insights (generate_run_ai_insights)
- Added header to MCP cost estimation (estimate_job_cost_with_mcp_fallback)

All AI-powered insights now display:
"Analyzed by Gemini-2.5-flash" with Google Gemini logo

app.py

@@ -71,6 +71,18 @@ from screens.mcp_helpers import (
 from utils.navigation import Navigator, Screen
 
 
+# Helper function for AI insights header
+def get_gemini_header() -> str:
+    """
+    Returns HTML header showing Gemini attribution for AI-generated insights
+    """
+    return """<div style="font-family: sans-serif; font-size: 0.8rem; color: #6B7280; border-bottom: 1px solid #E5E7EB; padding-bottom: 8px; margin-bottom: 8px;">
+    Analyzed by <strong style="color: #111827;">Gemini-2.5-flash</strong>
+    <br><span style="font-size: 0.7rem;">Provider: Gemini <img src='https://upload.wikimedia.org/wikipedia/commons/d/d9/Google_Gemini_logo_2025.svg' alt='logo' width='220' style='vertical-align: middle;'></span>
+</div>
+
+"""
+
 
 # Trace Detail handlers and helpers
 
@@ -735,7 +747,7 @@ def generate_insights():
             top_n=5
         )
 
-        return insights
+        return get_gemini_header() + insights
 
     except Exception as e:
         print(f"[ERROR] generate_insights: {e}")
@@ -776,7 +788,7 @@ def ask_about_trace(question: str) -> str:
             question=question
         )
 
-        return answer
+        return get_gemini_header() + answer
 
     except Exception as e:
         print(f"[ERROR] ask_about_trace: {e}")
@@ -848,7 +860,7 @@ def generate_ai_comparison(comparison_focus: str) -> str:
             comparison_focus=comparison_focus
         )
 
-        return insights
+        return get_gemini_header() + insights
 
     except Exception as e:
         print(f"[ERROR] generate_ai_comparison: {e}")
@@ -887,7 +899,7 @@ def generate_run_ai_insights(focus_area: str, max_rows: int) -> str:
             max_rows=max_rows
         )
 
-        return insights
+        return get_gemini_header() + insights
 
     except Exception as e:
         print(f"[ERROR] generate_run_ai_insights: {e}")
@@ -2676,6 +2688,8 @@ No historical data available for **{model}**.
 
 **🤖 Powered by MCP Server + Gemini 2.5 Pro**
 
+{get_gemini_header()}
+
 *This estimate was generated by AI analysis since no historical data is available for this model.*
 {hardware_note}
 ---