feat: US-014 - Update to Gemini 3 Flash Preview with model indicator

src/components/ChatWidget.tsx

@@ -6,6 +6,7 @@ import {
   isGeminiAvailable,
   parseItemIds,
   stripItemsSuffix,
+  GEMINI_DISPLAY_NAME,
   type ChatMessage,
 } from '@/lib/gemini'
 import { buildPaletteData } from '@/lib/search'
@@ -246,15 +247,26 @@ export function ChatWidget({ onAction }: ChatWidgetProps) {
                   flexShrink: 0,
                 }}
               >
-                <span
-                  style={{
-                    fontSize: '14px',
-                    fontWeight: 600,
-                    color: 'var(--text-primary)',
-                  }}
-                >
-                  Ask about Andy
-                </span>
+                <div style={{ display: 'flex', alignItems: 'baseline', gap: '8px' }}>
+                  <span
+                    style={{
+                      fontSize: '14px',
+                      fontWeight: 600,
+                      color: 'var(--text-primary)',
+                    }}
+                  >
+                    Ask about Andy
+                  </span>
+                  <span
+                    className="font-geist"
+                    style={{
+                      fontSize: '11px',
+                      color: 'var(--text-tertiary)',
+                    }}
+                  >
+                    {GEMINI_DISPLAY_NAME}
+                  </span>
+                </div>
                 <button
                   onClick={() => setIsOpen(false)}
                   aria-label="Close chat"

src/lib/gemini.ts

@@ -5,7 +5,10 @@ export interface ChatMessage {
   content: string
 }
 
-const GEMINI_API_BASE = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash'
+export const GEMINI_MODEL = 'gemini-3-flash-preview'
+export const GEMINI_DISPLAY_NAME = 'Gemini 3 Flash'
+
+const GEMINI_API_BASE = `https://generativelanguage.googleapis.com/v1beta/models/${GEMINI_MODEL}`
 
 function getApiKey(): string | undefined {
   return import.meta.env.VITE_GEMINI_API_KEY as string | undefined
@@ -19,20 +22,23 @@ function buildSystemPrompt(): string {
   const texts = buildEmbeddingTexts()
   const cvContent = texts.map((t) => `- ${t.text}`).join('\n')
 
-  return `You are an AI assistant embedded in Andy Charlwood's professional portfolio website. Your role is to answer questions about Andy's professional experience, skills, projects, and qualifications accurately and concisely.
+  return `You are an AI assistant on Andy Charlwood's portfolio website. Answer questions about his experience, skills, projects, and qualifications.
 
-Here is Andy's complete professional profile:
+## Andy's Professional Profile
 
 ${cvContent}
 
-Instructions:
-- Answer questions based ONLY on the information above. Do not invent roles, dates, or achievements.
-- Be concise — 2-4 sentences for most answers.
-- Be professional but friendly in tone.
-- If asked something not covered by the profile data, say you don't have that information.
-- At the end of your response, on a new line, include relevant portfolio item IDs in this format: [ITEMS: id1, id2, id3]
-- Only include item IDs that are directly relevant to your answer. The available IDs are the ones listed above (e.g., exp-*, skill-*, proj-*, ach-*, edu-*, action-*).
-- If no items are particularly relevant, omit the [ITEMS: ...] line entirely.`
+## Rules
+1. Use ONLY the profile above. Never invent roles, dates, or achievements.
+2. Be concise (2-4 sentences). Be professional but friendly.
+3. If the information isn't in the profile, say so.
+
+## Item References
+After your answer, on a NEW line, list relevant portfolio item IDs:
+[ITEMS: id1, id2, id3]
+- IDs match the profile entries above (exp-*, skill-*, proj-*, ach-*, edu-*, action-*).
+- Only include IDs directly relevant to your answer.
+- If no items are relevant, omit the [ITEMS: ...] line entirely.`
 }
 
 function buildRequestBody(