chore: migrate lucide package and close quick TODO cleanups

src/lib/ae_core/ae_comp__hosted_files_download_button.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 // *** Import Svelte specific
-import * as Lucide from 'lucide-svelte';
+import * as Lucide from '@lucide/svelte';
 import { fade } from 'svelte/transition';
 
 // *** Import Aether specific variables and functions

src/lib/ae_core/ae_comp__hosted_files_upload.svelte

@@ -2,7 +2,7 @@
 // untrack import removed — task_id sync now uses direct $effect (no untrack needed)
 // Imports
 // Import components and elements
-import * as Lucide from 'lucide-svelte';
+import * as Lucide from '@lucide/svelte';
 import Element_input_files_tbl from '$lib/elements/element_input_files_tbl.svelte';
 
 // Import storage, functions, and libraries

src/lib/ae_utils/ae_utils__file_extension_icon_lucide.ts

@@ -1,4 +1,4 @@
-import * as Lucide from 'lucide-svelte';
+import * as Lucide from '@lucide/svelte';
 
 /**
  * Returns a Lucide icon component based on the provided file extension.