refactor: Standardize data processing and update to Svelte 5 runes

This commit introduces a major refactoring of the data processing logic across multiple modules (events, archives, posts, sponsorships) to use a standardized pattern with . This improves consistency and maintainability.

Key changes:
- Replaced module-specific data processing with a generic helper.
- Removed deprecated  functions.
- Updated Svelte components to leverage the new Svelte 5 runes, simplifying state management.
- Fixed linting errors and updated test configurations.
- Added .

src/lib/electron/electron_native.js

@@ -340,7 +340,7 @@ async function get_url_cfg(cfg) {
             }
         return return_data;
     })
-    .catch(function (error: any) {
+    .catch(function (error) {
         console.log(`Base URL: ${base_url} | Endpoint: ${endpoint}`);
 
         console.log('Error Message:', error.message); // Is this needed here or below in the in the else portion???