Various QoL fixes for Desktop App (#2999)

* Some ESLint fixes

* Add login/logout signal to API, clear mentions on logout and flush cookies on login/logout

* Fix issue where local and HTTP-only servers would not validate correctly

* Reduce noise of renderer logging, adjust a few local renderer logs to be louder when needed

* Fallback to beginning of hostname for servers that don't change the site name

* Fix Save Image crash

* Update the name for insecure servers too

* Fix test

* Fix lint

* Reduce repetition

src/renderer/index.tsx

@@ -56,7 +56,7 @@ class Root extends React.PureComponent<Record<string, never>, State> {
             const configRequest = await window.desktop.getConfiguration() as CombinedConfig;
             return configRequest;
         } catch (err: any) {
-            console.log(`there was an error with the config: ${err}`);
+            console.error(`there was an error with the config: ${err}`);
             if (exitOnError) {
                 window.desktop.quit(`unable to load configuration: ${err}`, err.stack);
             }