WIP: Electron asset path and renderer build fixes

- Configure Vite renderer build for relative asset paths and explicit asset directory
- Remove baseURLForDataURL (caused Electron crash)
- Add debug logging for asset/network requests
- App now loads and assets are found, but some stylesheets may still be missing

Next: investigate CSS chunking/code splitting for Electron reliability.

temp.har

@@ -0,0 +1,11 @@
+{
+  "log": {
+    "version": "1.2",
+    "creator": {
+      "name": "WebInspector",
+      "version": "537.36"
+    },
+    "pages": [],
+    "entries": []
+  }
+}