refactor(ui): standardize button types and migrate file operations to V3 Action API

src/lib/ae_core/ae_comp__site_config_editor.svelte

@@ -4,6 +4,8 @@
      * Specialized UI for managing site.cfg_json settings.
      * Supports General, AI, Performance, and IDAA-specific configurations.
      */
+    import { Modal } from 'flowbite-svelte';
+    import { untrack } from 'svelte';
     import { 
         Palette, Mail, Brain, Timer, 
         ShieldCheck, CodeXml, Save, 

src/lib/element_qr_scanner_v2.svelte

@@ -557,12 +557,6 @@
         align-content: stretch;
     }
 
-    .ae_element.qr_scanner div.qr_scanner_viewfinder {
-        /* max-width: 100vw; */
-        /* contain: content; */
-        /* contain: contain; */
-    }
-
     .qr_scanner .qr_scanner_viewfinder {
         /* outline: dashed medium blue; */
         min-width: 400px;

src/lib/elements/element_input_files_tbl.svelte

@@ -422,11 +422,6 @@
         font-size: smaller;
     }
 
-    .file_size,
-    .file_type {
-        /* font-size: smaller; */
-    }
-
     .file_hash {
         font-family: 'Courier New', Courier, monospace;
     }