fix: improve dropbox loading resilience and fix dev proxy

api/dropbox-proxy.js

@@ -25,8 +25,7 @@ export default async function handler(req, res) {
   try {
     accessToken = await getAccessToken();
   } catch (err) {
-    console.error('Token refresh error:', err);
-    return res.status(500).json({ error: err.message });
+    console.warn('Token refresh optional failure (sharing link might still work):', err.message);
   }
 
   if (req.method === 'GET' && req.query.info === '1') {

vite.config.ts

@@ -21,7 +21,7 @@ export default defineConfig(({mode}) => {
       hmr: process.env.DISABLE_HMR !== 'true',
       proxy: {
         '/dropbox-file': {
-          target: 'https://dl.dropboxusercontent.com',
+          target: 'https://www.dropbox.com',
           changeOrigin: true,
           rewrite: (path) => path.replace(/^\/dropbox-file/, ''),
         },