feat(reports): add created_on timestamps and detail links to file downloads report

Show upload timestamp for every file; bold the newest upload per session/presenter
group so staff can quickly identify the most recent version. Add Session/Presenter
navigation links in each card header for direct access without searching.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/events/[event_id]/(pres_mgmt)/reports/reports_file_downloads.svelte

@@ -27,6 +27,7 @@ import MyClipboard from '$lib/app_components/e_app_clipboard.svelte';
 import {
     ArrowUpDown,
     Download,
+    ExternalLink,
     FileText,
     LoaderCircle,
     RefreshCw,
@@ -148,6 +149,11 @@ function build_filename(file: any, fmt: FormatKey): string {
     return `${pre}${stem}${suf}.${ext}`;
 }
 
+// Returns the largest created_on string in a file list — identifies the newest upload per group.
+function newest_in_group(files: { created_on?: string | null }[]): string {
+    return files.reduce((max, f) => ((f.created_on ?? '') > max ? (f.created_on ?? '') : max), '');
+}
+
 // Strip :443 from https URLs — redundant and clutters shareable links.
 let base_url = $derived($ae_api.base_url.replace(/^(https:\/\/[^/:]+):443(\/|$)/, '$1$2'));
 
@@ -416,6 +422,7 @@ async function handle_qry() {
 {:else}
     {#each session_groups as sg (sg.session_id)}
         {@const has_any = sg.session_files.length > 0 || sg.presenter_groups.length > 0}
+        {@const newest_session_ts = newest_in_group(sg.session_files)}
         {#if has_any}
             <!-- Session card -->
             <section class="border-surface-300-700 bg-surface-50-900 my-2 rounded-lg border">
@@ -435,6 +442,15 @@ async function handle_qry() {
                         {sg.session_files.length} session file{sg.session_files.length !== 1 ? 's' : ''},
                         &nbsp;{sg.presenter_groups.reduce((n, pg) => n + pg.files.length, 0)} presenter file{sg.presenter_groups.reduce((n, pg) => n + pg.files.length, 0) !== 1 ? 's' : ''}
                     </span>
+                    {#if sg.session_id !== '__no_session__'}
+                        <a
+                            href="/events/{$events_slct.event_id}/session/{sg.session_id}"
+                            class="btn btn-xs preset-tonal-surface shrink-0 opacity-50 hover:opacity-100 transition-opacity"
+                            title="View session: {sg.session_name}">
+                            <ExternalLink size="0.8em" class="mr-0.5" />
+                            Session
+                        </a>
+                    {/if}
                 </div>
 
                 <div class="divide-surface-200-800 divide-y px-2 py-1">
@@ -452,6 +468,7 @@ async function handle_qry() {
                                     {@const computed_name = build_filename(file, selected_format)}
                                     {@const dl_url = build_download_url(file, selected_format)}
                                     {@const is_long = computed_name.length > FILENAME_WARN_LEN}
+                                    {@const is_newest = !!file.created_on && file.created_on === newest_session_ts}
                                     <div class="border-surface-100-900 hover:bg-surface-100-900 flex flex-row items-center gap-2 border-t py-1.5 transition-colors">
                                         <!-- Left: filenames (grows, min-w-0 allows truncation) -->
                                         <div class="flex min-w-0 grow flex-col gap-0.5">
@@ -466,6 +483,16 @@ async function handle_qry() {
                                                 title="{computed_name}{is_long ? ` (${computed_name.length} chars — may be long for some systems)` : ''}">
                                                 {computed_name}
                                             </span>
+                                            {#if file.created_on}
+                                                <span
+                                                    class="tabular-nums text-xs"
+                                                    class:opacity-40={!is_newest}
+                                                    class:font-bold={is_newest}
+                                                    title="Uploaded: {file.created_on}">
+                                                    {ae_util.iso_datetime_formatter(file.created_on, 'date_iso')}
+                                                    &nbsp;{ae_util.iso_datetime_formatter(file.created_on, 'time_12_short_no_leading')}
+                                                </span>
+                                            {/if}
                                         </div>
                                         <!-- File size -->
                                         <span class="shrink-0 whitespace-nowrap text-xs opacity-50">
@@ -496,21 +523,35 @@ async function handle_qry() {
 
                     <!-- ---- Presenter-level files ---- -->
                     {#each sg.presenter_groups as pg (pg.presenter_id)}
+                        {@const newest_presenter_ts = newest_in_group(pg.files)}
                         <div class="py-2">
-                            <h4 class="mb-1 flex items-center gap-1 text-xs font-bold tracking-wider opacity-60">
+                            <!-- Wrap h4 + link so the link sits outside the opacity-60 container -->
-                                <User size="0.9em" />
+                            <div class="mb-1 flex items-center gap-2">
-                                {pg.presenter_full_name || '— presenter name not set —'}
+                                <h4 class="flex grow items-center gap-1 text-xs font-bold tracking-wider opacity-60">
-                                {#if pg.presentation_name}
+                                    <User size="0.9em" />
-                                    <span class="font-normal normal-case opacity-80">— {pg.presentation_name}</span>
+                                    {pg.presenter_full_name || '— presenter name not set —'}
+                                    {#if pg.presentation_name}
+                                        <span class="font-normal normal-case opacity-80">— {pg.presentation_name}</span>
+                                    {/if}
+                                    <span class="font-normal normal-case">({pg.files.length} file{pg.files.length !== 1 ? 's' : ''})</span>
+                                </h4>
+                                {#if pg.presenter_id !== '__unknown__'}
+                                    <a
+                                        href="/events/{$events_slct.event_id}/presenter/{pg.presenter_id}"
+                                        class="btn btn-xs preset-tonal-surface shrink-0 opacity-50 hover:opacity-100 transition-opacity"
+                                        title="View presenter: {pg.presenter_full_name}">
+                                        <ExternalLink size="0.75em" class="mr-0.5" />
+                                        Presenter
+                                    </a>
                                 {/if}
-                                <span class="font-normal normal-case">({pg.files.length} file{pg.files.length !== 1 ? 's' : ''})</span>
+                            </div>
-                            </h4>
                             <div class="flex flex-col">
                                 {#each pg.files as file (file.event_file_id)}
                                     {@const ExtIcon = ae_util.file_extension_icon_lucide(file.extension)}
                                     {@const computed_name = build_filename(file, selected_format)}
                                     {@const dl_url = build_download_url(file, selected_format)}
                                     {@const is_long = computed_name.length > FILENAME_WARN_LEN}
+                                    {@const is_newest = !!file.created_on && file.created_on === newest_presenter_ts}
                                     <div class="border-surface-100-900 hover:bg-surface-100-900 flex flex-row items-center gap-2 border-t py-1.5 transition-colors">
                                         <!-- Left: filenames (grows, min-w-0 allows truncation) -->
                                         <div class="flex min-w-0 grow flex-col gap-0.5">
@@ -525,6 +566,16 @@ async function handle_qry() {
                                                 title="{computed_name}{is_long ? ` (${computed_name.length} chars — may be long for some systems)` : ''}">
                                                 {computed_name}
                                             </span>
+                                            {#if file.created_on}
+                                                <span
+                                                    class="tabular-nums text-xs"
+                                                    class:opacity-40={!is_newest}
+                                                    class:font-bold={is_newest}
+                                                    title="Uploaded: {file.created_on}">
+                                                    {ae_util.iso_datetime_formatter(file.created_on, 'date_iso')}
+                                                    &nbsp;{ae_util.iso_datetime_formatter(file.created_on, 'time_12_short_no_leading')}
+                                                </span>
+                                            {/if}
                                         </div>
                                         <!-- File size -->
                                         <span class="shrink-0 whitespace-nowrap text-xs opacity-50">