feat(ui): redesign voice cockpit with clinical companion drawer, Svelte 5 migration, and Gemini 3.8 voice

- Re-architect VoiceSession into full-bleed studio cockpit with overlay slide-over companion drawer
- Eliminate width squishing defect on LiveInsightPanel and add native dark/light theme support
- Integrate authentic Google Gemini 3.8 Flash TTS with Fenrir persona and fallback audio pipeline
- Implement comprehensive Playwright E2E visual regression suite across Desktop, iPad, and iPhone (21 tests, 45 snapshots)
- Migrate core application to Svelte 5 runes (, , ) with reactive stores
- Maintain .NET 8 Azure Functions serverless endpoints and clean build hygiene

vite.config.ts

@@ -1,6 +1,8 @@
+/// <reference types="vitest" />
 import path from 'path';
 import { defineConfig, loadEnv } from 'vite';
 import react from '@vitejs/plugin-react';
+import { svelte } from '@sveltejs/vite-plugin-svelte';
 import { VitePWA } from 'vite-plugin-pwa';
 import pkg from './package.json';
 
@@ -13,6 +15,7 @@ export default defineConfig(({ mode }) => {
     },
     plugins: [
       react(),
+      svelte(),
       VitePWA({
         strategies: 'injectManifest',
         srcDir: '.',
@@ -51,15 +54,34 @@ export default defineConfig(({ mode }) => {
       })
     ],
     define: {
-      'process.env.API_KEY': JSON.stringify(env.VITE_GEMINI_API_KEY),
-      'process.env.GEMINI_API_KEY': JSON.stringify(env.VITE_GEMINI_API_KEY),
+      'process.env.OPENROUTER_API_KEY': JSON.stringify(env.VITE_OPENROUTER_API_KEY || env.OPENROUTER_API_KEY || ''),
+      'process.env.GEMINI_API_KEY': JSON.stringify(env.VITE_GEMINI_API_KEY || env.GEMINI_API_KEY || ''),
+      'process.env.API_KEY': JSON.stringify(env.VITE_GEMINI_API_KEY || env.GEMINI_API_KEY || ''),
       '__APP_VERSION__': JSON.stringify(pkg.version),
       '__BUILD_TIMESTAMP__': JSON.stringify(new Date().toISOString()),
     },
+    build: {
+      chunkSizeWarningLimit: 600,
+      rollupOptions: {
+        output: {
+          manualChunks(id) {
+            if (id.includes('node_modules')) {
+              if (id.includes('@lucide/svelte') || id.includes('lucide-react')) return 'vendor-icons';
+              if (id.includes('svelte')) return 'vendor-svelte';
+              if (id.includes('workbox')) return 'vendor-workbox';
+            }
+          }
+        }
+      }
+    },
     resolve: {
       alias: {
         '@': path.resolve(__dirname, '.'),
       }
+    },
+    test: {
+      include: ['test/**/*.test.ts'],
+      environment: 'node'
     }
   };
 });