feat(hosted-files): introduce standardized download component and V3 action support

- Created AE_Comp_Hosted_Files_Download_Button using Svelte 5 and Lucide icons.
- Added file_extension_icon_lucide utility for direct Lucide icon mapping.
- Refactored download logic to core__hosted_files.ts using V3 Action endpoint (/v3/action/hosted_file/.../download).
- Integrated new component into Event File Object Table.
- Cleaned up legacy window.postMessage calls in several file management views.

NOTE: The new download component is currently in development and may not be fully functional.

src/lib/ae_utils/ae_utils.ts

@@ -8,6 +8,7 @@ import {
 } from './ae_utils__files';
 import { get_obj_li_w_match_prop } from './ae_utils__get_obj_li_w_match_prop';
 import { file_extension_icon } from './ae_utils__file_extension_icon';
+import { file_extension_icon_lucide } from './ae_utils__file_extension_icon_lucide';
 import { process_permission_checks } from './ae_utils__perm_checks';
 import { iso_datetime_formatter } from './ae_utils__datetime_format';
 import { is_datetime_recent } from './ae_utils__is_datetime_recent';
@@ -337,6 +338,7 @@ export const ae_util = {
     shorten_string: shorten_string,
     shorten_filename: shorten_filename,
     file_extension_icon: file_extension_icon,
+    file_extension_icon_lucide: file_extension_icon_lucide,
     format_html: format_html,
     set_obj_prop_display_name: set_obj_prop_display_name,
     return_obj_type_path: return_obj_type_path,

src/lib/ae_utils/ae_utils__file_extension_icon_lucide.ts

@@ -0,0 +1,66 @@
+import * as Lucide from 'lucide-svelte';
+
+/**
+ * Returns a Lucide icon component based on the provided file extension.
+ * @param extension The file extension (e.g., 'pdf', 'jpg').
+ * @returns The Lucide icon component.
+ */
+export function file_extension_icon_lucide(extension: string | undefined | null): any {
+    const ext = extension?.toLowerCase() || '';
+    
+    const icon_map: Record<string, any> = {
+        'pdf': Lucide.FileText,
+        'doc': Lucide.FileText,
+        'docx': Lucide.FileText,
+        'txt': Lucide.FileText,
+        'rtf': Lucide.FileText,
+        
+        'xls': Lucide.FileSpreadsheet,
+        'xlsx': Lucide.FileSpreadsheet,
+        'csv': Lucide.FileSpreadsheet,
+        
+        'png': Lucide.FileImage,
+        'jpg': Lucide.FileImage,
+        'jpeg': Lucide.FileImage,
+        'gif': Lucide.FileImage,
+        'webp': Lucide.FileImage,
+        'bmp': Lucide.FileImage,
+        'svg': Lucide.FileImage,
+        
+        'mp3': Lucide.FileAudio,
+        'wav': Lucide.FileAudio,
+        'm4a': Lucide.FileAudio,
+        'flac': Lucide.FileAudio,
+        'aac': Lucide.FileAudio,
+        'aif': Lucide.FileAudio,
+        'aiff': Lucide.FileAudio,
+        
+        'mp4': Lucide.FileVideo,
+        'mkv': Lucide.FileVideo,
+        'mov': Lucide.FileVideo,
+        'avi': Lucide.FileVideo,
+        '3gp': Lucide.FileVideo,
+        
+        'ppt': Lucide.Presentation,
+        'pptx': Lucide.Presentation,
+        'key': Lucide.Presentation,
+        'odp': Lucide.Presentation,
+        
+        'zip': Lucide.FileArchive,
+        '7z': Lucide.FileArchive,
+        'rar': Lucide.FileArchive,
+        'tar': Lucide.FileArchive,
+        'gz': Lucide.FileArchive,
+        
+        'json': Lucide.FileJson,
+        
+        'html': Lucide.FileCode,
+        'htm': Lucide.FileCode,
+        'js': Lucide.FileCode,
+        'ts': Lucide.FileCode,
+        'css': Lucide.FileCode,
+        'php': Lucide.FileCode
+    };
+
+    return icon_map[ext] || Lucide.File;
+}