config: Enable browser-only launch mode by default

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

client/config.json

@@ -3,7 +3,7 @@
   "uploadTimeout": 600000,
   "appTitle": "Meeting Assistant",
   "ui": {
-    "launchBrowser": false
+    "launchBrowser": true
   },
   "whisper": {
     "model": "medium",