feat(hosted-files): finalize download button UI with fixed spinner, divider, and alternating status view

src/lib/ae_core/ae_comp__hosted_files_download_button.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
     // *** Import Svelte specific
     import * as Lucide from 'lucide-svelte';
+    import { fade } from 'svelte/transition';
 
     // *** Import Aether specific variables and functions
     import type { key_val } from '$lib/stores/ae_stores';
@@ -26,6 +27,7 @@
         download_status_msg?: string;
         variant?: 'tonal' | 'filled' | 'outline' | 'ghost';
         color?: 'primary' | 'secondary' | 'tertiary' | 'success' | 'warning' | 'error' | 'surface';
+        show_divider?: boolean;
         classes?: string;
         label?: import('svelte').Snippet;
     }
@@ -44,6 +46,7 @@
         download_status_msg = $bindable('Not started'),
         variant = 'tonal',
         color = 'primary',
+        show_divider = true,
         classes = '',
         label
     }: Props = $props();
@@ -95,11 +98,14 @@
     };
 
     let variant_classes = $derived.by(() => {
-        const base = 'btn btn-sm lg:btn-md min-w-48 transition-all';
+        const base = 'btn btn-sm lg:btn-md min-w-48 transition-all overflow-hidden';
         const style = color_map[color]?.[variant] || color_map.primary.tonal;
         return `${base} ${style} ${classes}`.trim();
     });
 
+    let show_filename_view = $state(true);
+    let status_interval: any;
+
     $effect(() => {
         if (log_lvl) {
             console.log(
@@ -118,6 +124,33 @@
                 $ae_sess.api_download_kv[file_id].percent_completed;
         }
     });
+
+    // Reactive timer to alternate views during active download
+    $effect(() => {
+        const file_id = hosted_file_obj?.id || hosted_file_obj?.hosted_file_id || hosted_file_id;
+        const is_actively_downloading = ae_promises[file_id] && download_complete === undefined;
+
+        if (is_actively_downloading) {
+            if (!status_interval) {
+                status_interval = setInterval(() => {
+                    show_filename_view = !show_filename_view;
+                }, 3000);
+            }
+        } else {
+            if (status_interval) {
+                clearInterval(status_interval);
+                status_interval = null;
+            }
+            show_filename_view = true; // Default view when not downloading
+        }
+
+        return () => {
+            if (status_interval) {
+                clearInterval(status_interval);
+                status_interval = null;
+            }
+        };
+    });
 </script>
 
 {#if hosted_file_id && hosted_file_obj}
@@ -159,39 +192,77 @@
         title={`Download this file:\n${filename ?? hosted_file_obj?.filename}\n[API] SHA256: ${hosted_file_obj?.hash_sha256?.slice(0, 10)}...\nHosted ID: ${file_id}\n Linked to: ${linked_to_type} ID: ${linked_to_id}`}
     >
         {#await ae_promises[file_id]}
-            <Lucide.Loader2 class="animate-spin mr-2" size={18} />
+            <div class="flex items-center w-full min-h-[1.5rem]">
-            <span class="">
+                <div 
-                Downloading
+                    class="flex items-center pr-2 shrink-0 {show_divider ? 'border-r border-surface-500/30 mr-2' : ''}" 
-                {#if $ae_sess.api_download_kv[file_id]}
+                >
-                    {$ae_sess.api_download_kv[file_id]
+                    <Lucide.Loader2 class="animate-spin" size={18} />
-                        .percent_completed}%
+                </div>
-                {/if}
+                <div class="grow relative text-left h-full">
-                :
+                    {#if show_filename_view}
-            </span>
+                        <div in:fade={{ duration: 250 }} out:fade={{ duration: 250 }} class="flex items-center h-full">
+                            <span class="truncate">
+                                {ae_util.shorten_filename({
+                                    filename: filename ?? hosted_file_obj?.filename,
+                                    max_length: max_length
+                                })}
+                            </span>
+                        </div>
+                    {:else}
+                        <div in:fade={{ duration: 250 }} out:fade={{ duration: 250 }} class="absolute inset-0 flex items-center h-full">
+                            <span class="font-bold whitespace-nowrap">
+                                Downloading:
+                                {#if $ae_sess.api_download_kv[file_id]}
+                                    {$ae_sess.api_download_kv[file_id].percent_completed}%
+                                {:else}
+                                    ...
+                                {/if}
+                            </span>
+                        </div>
+                    {/if}
+                </div>
+            </div>
         {:then}
             {#if label}
                 {@render label()}
             {:else}
                 {@const IconComp = ae_util.file_extension_icon_lucide(hosted_file_obj?.extension)}
-                <IconComp size={18} class="mr-2" />
+                <div class="flex items-center w-full">
-                <span class="grow">
+                    <div 
-                    {ae_util.shorten_filename({
+                        class="flex items-center pr-2 shrink-0 {show_divider ? 'border-r border-surface-500/30 mr-2' : ''}" 
-                        filename: filename ?? hosted_file_obj?.filename,
+                    >
-                        max_length: max_length
+                        <IconComp size={18} />
-                    })}
+                    </div>
-                </span>
+                    <span class="grow truncate text-left">
+                        {ae_util.shorten_filename({
+                            filename: filename ?? hosted_file_obj?.filename,
+                            max_length: max_length
+                        })}
+                    </span>
+                    {#if hosted_file_obj?.file_purpose || hosted_file_obj?.group}
+                        <span class="badge preset-tonal-success ml-2 text-[10px] uppercase font-bold shrink-0">
+                            {hosted_file_obj.file_purpose || hosted_file_obj.group}
+                        </span>
+                    {/if}
+                </div>
             {/if}
         {/await}
 
         {#if download_complete === null}
-            <span class="text-red-800 dark:text-red-200 ml-2">File not found</span>
+            <span class="text-red-800 dark:text-red-200 ml-2 whitespace-nowrap">File not found</span>
         {:else if download_complete === false}
-            <span class="text-red-800 dark:text-red-200 ml-2">Failed to download!</span>
+            <span class="text-red-800 dark:text-red-200 ml-2 whitespace-nowrap text-xs">Failed!</span>
         {/if}
     </button>
 {:else}
-    <button type="button" disabled class={classes ?? 'btn'} title="No file selected">
+    <button type="button" disabled class={variant_classes} title="No file selected">
-        <Lucide.FileX size={18} class="mr-2" />
+        <div class="flex items-center w-full">
-        <span class="grow"> No file info </span>
+            <div 
+                class="flex items-center pr-2 shrink-0 {show_divider ? 'border-r border-surface-500/30 mr-2' : ''}" 
+            >
+                <Lucide.FileX size={18} />
+            </div>
+            <span class="grow text-left"> No file info </span>
+        </div>
     </button>
 {/if}