Tidy Tauri code and enable "Open file in Stirling PDF" (#4836)

# Description of Changes
Tidy Tauri code and enable "Open file in Stirling PDF"

frontend/src/desktop/contexts/AppConfigContext.tsx

@@ -1,135 +0,0 @@
-import React, { createContext, useContext, useState, useEffect } from 'react';
-import apiClient from '@app/services/apiClient';
-
-// Retry configuration
-const MAX_RETRIES = 5;
-const INITIAL_DELAY = 1000; // 1 second
-
-/**
- * Sleep utility for delays
- */
-function sleep(ms: number): Promise<void> {
-  return new Promise(resolve => setTimeout(resolve, ms));
-}
-
-export interface AppConfig {
-  baseUrl?: string;
-  contextPath?: string;
-  serverPort?: number;
-  appNameNavbar?: string;
-  languages?: string[];
-  enableLogin?: boolean;
-  enableEmailInvites?: boolean;
-  isAdmin?: boolean;
-  enableAlphaFunctionality?: boolean;
-  enableAnalytics?: boolean | null;
-  enablePosthog?: boolean | null;
-  enableScarf?: boolean | null;
-  premiumEnabled?: boolean;
-  premiumKey?: string;
-  termsAndConditions?: string;
-  privacyPolicy?: string;
-  cookiePolicy?: string;
-  impressum?: string;
-  accessibilityStatement?: string;
-  runningProOrHigher?: boolean;
-  runningEE?: boolean;
-  license?: string;
-  SSOAutoLogin?: boolean;
-  serverCertificateEnabled?: boolean;
-  error?: string;
-}
-
-interface AppConfigContextValue {
-  config: AppConfig | null;
-  loading: boolean;
-  error: string | null;
-  refetch: () => Promise<void>;
-}
-
-// Create context
-const AppConfigContext = createContext<AppConfigContextValue | undefined>(undefined);
-
-/**
- * Provider component that fetches and provides app configuration
- * Should be placed at the top level of the app, before any components that need config
- */
-export const AppConfigProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
-  const [config, setConfig] = useState<AppConfig | null>(null);
-  const [loading, setLoading] = useState(true);
-  const [error, setError] = useState<string | null>(null);
-
-  const fetchConfig = async () => {
-    setLoading(true);
-    setError(null);
-
-
-    for (let attempt = 0; attempt <= MAX_RETRIES; attempt++) {
-      try {
-        if (attempt > 0) {
-          const delay = INITIAL_DELAY * Math.pow(2, attempt - 1);
-          console.log(`[AppConfig] Retry attempt ${attempt}/${MAX_RETRIES} after ${delay}ms delay...`);
-          await sleep(delay);
-        } else {
-          console.log('[AppConfig] Fetching app config...');
-        }
-
-        const response = await apiClient.get<AppConfig>('/api/v1/config/app-config');
-
-        setConfig(response.data);
-        console.log('[AppConfig] Successfully fetched app config');
-        setLoading(false);
-        return; // Success - exit function
-      } catch (err: any) {
-        const status = err?.response?.status;
-
-        // Check if we should retry (network errors or 5xx errors)
-        const shouldRetry = (!status || status >= 500) && attempt < MAX_RETRIES;
-
-        if (shouldRetry) {
-          console.warn(`[AppConfig] Attempt ${attempt + 1} failed (status ${status || 'network error'}):`, err.message, '- will retry...');
-          continue;
-        }
-
-        // Final attempt failed or non-retryable error (4xx)
-        const errorMessage = err?.response?.data?.message || err?.message || 'Unknown error occurred';
-        setError(errorMessage);
-        console.error(`[AppConfig] Failed to fetch app config after ${attempt + 1} attempts:`, err);
-        break;
-      }
-    }
-
-    setLoading(false);
-  };
-
-  useEffect(() => {
-    fetchConfig();
-  }, []);
-
-  const value: AppConfigContextValue = {
-    config,
-    loading,
-    error,
-    refetch: fetchConfig,
-  };
-
-  return (
-    <AppConfigContext.Provider value={value}>
-      {children}
-    </AppConfigContext.Provider>
-  );
-};
-
-/**
- * Hook to access application configuration
- * Must be used within AppConfigProvider
- */
-export function useAppConfig(): AppConfigContextValue {
-  const context = useContext(AppConfigContext);
-
-  if (context === undefined) {
-    throw new Error('useAppConfig must be used within AppConfigProvider');
-  }
-
-  return context;
-}