feat: enhance configuration fetching and implement retry logic for API requests

hooks/use-config.ts

@@ -29,7 +29,7 @@ interface AppConfig extends ConfigData {
 let configCache: ConfigData | null = null;
 let configPromise: Promise<ConfigData> | null = null;
 
-async function fetchConfig(): Promise<ConfigData> {
+export async function fetchConfig(): Promise<ConfigData> {
   // Return cached config if available
   if (configCache) {
     return configCache;

stores/auth-store.ts

@@ -8,6 +8,7 @@ import { useVacationStore } from './vacation-store';
 import { useCalendarStore } from './calendar-store';
 import { useFilterStore } from './filter-store';
 import { useSettingsStore } from './settings-store';
+import { fetchConfig } from '@/hooks/use-config';
 import { debug } from '@/lib/debug';
 import type { Identity } from '@/lib/jmap/types';
 
@@ -163,10 +164,13 @@ export const useAuthStore = create<AuthState>()(
             error: null,
           });
 
-          // Sync settings from server
+          // Sync settings from server (only if enabled)
+          fetchConfig().then(config => {
+            if (!config.settingsSyncEnabled) return;
             useSettingsStore.getState().loadFromServer(username, serverUrl).finally(() => {
               useSettingsStore.getState().enableSync(username, serverUrl);
             });
+          }).catch(() => {});
 
           if (rememberMe) {
             try {
@@ -242,10 +246,13 @@ export const useAuthStore = create<AuthState>()(
 
           scheduleRefresh(expires_in, get().refreshAccessToken);
 
-          // Sync settings from server
+          // Sync settings from server (only if enabled)
+          fetchConfig().then(config => {
+            if (!config.settingsSyncEnabled) return;
             useSettingsStore.getState().loadFromServer(username, serverUrl).finally(() => {
               useSettingsStore.getState().enableSync(username, serverUrl);
             });
+          }).catch(() => {});
 
           return true;
         } catch (error) {
@@ -393,10 +400,13 @@ export const useAuthStore = create<AuthState>()(
                   accessToken: token,
                 });
 
-                // Sync settings from server
+                // Sync settings from server (only if enabled)
-                useSettingsStore.getState().loadFromServer(state.username || '', state.serverUrl).finally(() => {
+                fetchConfig().then(config => {
+                  if (!config.settingsSyncEnabled) return;
+                  useSettingsStore.getState().loadFromServer(state.username || '', state.serverUrl!).finally(() => {
                     useSettingsStore.getState().enableSync(state.username || '', state.serverUrl!);
                   });
+                }).catch(() => {});
                 return;
               }
             } catch (error) {
@@ -436,10 +446,13 @@ export const useAuthStore = create<AuthState>()(
                   authMode: 'basic',
                 });
 
-                // Sync settings from server
+                // Sync settings from server (only if enabled)
+                fetchConfig().then(config => {
+                  if (!config.settingsSyncEnabled) return;
                   useSettingsStore.getState().loadFromServer(username, serverUrl).finally(() => {
                     useSettingsStore.getState().enableSync(username, serverUrl);
                   });
+                }).catch(() => {});
                 return;
               }
             } catch (error) {