Pass apiUrl through OIDC redirect so SPA has it on return

The apiUrl configured on the Config page was lost when the webview
navigated away to localhost and back. Now it's included in the return
URL as ?desktop=1&apiUrl=...&token=...

web/src/lib/oidc.ts

@@ -103,7 +103,10 @@ export async function startLogin(): Promise<void> {
 
   if (isDesktop) {
     const apiUrl = getConfig().apiUrl || ''
-    const ret = encodeURIComponent(location.origin + location.pathname.replace(/\/$/, '') + '?desktop=1')
+    const ret = encodeURIComponent(
+      location.origin + location.pathname.replace(/\/$/, '') +
+      '?desktop=1&apiUrl=' + encodeURIComponent(apiUrl)
+    )
     location.href = `http://127.0.0.1:18901/oidc/start?apiUrl=${encodeURIComponent(apiUrl)}&ret=${ret}`
     return
   }

web/src/main.ts

@@ -7,7 +7,7 @@ function handleDesktopToken() {
   const params = new URLSearchParams(location.search)
   const token = params.get('token')
   if (token && new URLSearchParams(location.search).has('desktop')) {
-    const apiUrl = getConfig().apiUrl || ''
+    const apiUrl = params.get('apiUrl') || getConfig().apiUrl || ''
     setConfig({ apiUrl, token, isDesktop: true })
     initConfig({ apiUrl, token, isDesktop: true })
     params.delete('token')