feat(launcher): richer tooltip on file download button

Tooltip now shows file size, created/updated timestamps, and open_in_os
setting alongside the existing SHA256 and hosted ID info.

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

src/lib/ae_core/ae_comp__hosted_files_download_button.svelte

@@ -346,7 +346,20 @@ async function handle_click() {
             disabled={require_auth && !$ae_loc.authenticated_access}
             class={variant_classes}
             onclick={handle_click}
-            title={`Download this file:\n${final_filename}\n[API] SHA256: ${hosted_file_obj?.hash_sha256?.slice(0, 10)}...\nHosted ID: ${file_id}\n Linked to: ${linked_to_type} ID: ${linked_to_id}`}>
+            title={
+`Download this file:
+${final_filename}
+[API] SHA256: ${hosted_file_obj?.hash_sha256?.slice(0, 10)}...
+Hosted ID: ${file_id}
+
+File size: ${hosted_file_obj.file_size ? ae_util.format_bytes(hosted_file_obj.file_size) : 'Unknown size'}
+Created on: ${ae_util.iso_datetime_formatter(hosted_file_obj.created_on, 'datetime_short')}
+Updated on: ${ae_util.iso_datetime_formatter(hosted_file_obj.updated_on, 'datetime_short')}
+
+Open with: ${hosted_file_obj.open_in_os == 'win' ? 'Windows' : hosted_file_obj.open_in_os == 'mac' ? 'macOS' : hosted_file_obj.open_in_os == 'linux' ? 'Linux' : '--not set--'}
+
+Linked to Type: ${linked_to_type ?? '--none--'} ID: ${linked_to_id ?? '---'}`
+            }>
             {@render content()}
         </button>
     {/if}