fix: correct convert_file API path from /v3/action/hosted_file to /hosted_file

The endpoint is registered under the older hosted_file router at /hosted_file/{id}/convert_file,
not under the v3 actions router. Both list and table convert buttons were sending to the wrong path.

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

src/lib/elements/element_manage_event_file_li.svelte

@@ -80,7 +80,7 @@
     // WHY: Poster sessions display files in the Launcher modal via <img> tag — PDFs can't render there.
     // Presenters upload PDFs which must be converted server-side to high-res webp images.
     // Button is only shown in edit_mode for PDF files linked to a poster-type session.
-    // Backend: /v3/action/hosted_file/{id}/convert_file runs pdf2image (3840px wide, first page only)
+    // Backend: /hosted_file/{id}/convert_file runs pdf2image (3840px wide, first page only)
     // and saves the result as a new hosted_file record linked to the same parent object.
     type ConvertStatus = 'idle' | 'converting' | 'done' | 'error';
     let convert_status_kv: Record<string, ConvertStatus> = $state({});
@@ -98,7 +98,7 @@
                 || event_file_obj.event_presentation_id
                 || event_file_obj.event_id;
             const filename_no_ext = (event_file_obj.filename ?? 'poster_image').replace(/\.pdf$/i, '');
-            const url = `${$ae_api.base_url}/v3/action/hosted_file/${event_file_obj.hosted_file_id}/convert_file`
+            const url = `${$ae_api.base_url}/hosted_file/${event_file_obj.hosted_file_id}/convert_file`
                 + `?link_to_type=${encodeURIComponent(link_to_type_val)}`
                 + `&link_to_id=${encodeURIComponent(link_to_id_val)}`
                 + `&filename_no_ext=${encodeURIComponent(filename_no_ext)}`
@@ -281,10 +281,6 @@
                                                     </button>
                                                 {/if}
                                             </div>
-                                        {:else}
-                                            <!-- this is showing -->
-                                            test test test
-                                            <!-- this is showing -->
                                         {/if}
 
                                         {#if ae_tmp.show__direct_download}

src/routes/events/ae_comp__event_file_obj_tbl.svelte

@@ -69,7 +69,7 @@
     // WHY: Poster sessions display files in the Launcher modal via <img> tag — PDFs can't render there.
     // Presenters upload PDFs which must be converted server-side to high-res webp images.
     // Button is only shown in edit_mode for PDF files linked to a poster-type session.
-    // Backend: /v3/action/hosted_file/{id}/convert_file runs pdf2image (3840px wide, first page only)
+    // Backend: /hosted_file/{id}/convert_file runs pdf2image (3840px wide, first page only)
     // and saves the result as a new hosted_file record linked to the same parent object.
     type ConvertStatus = 'idle' | 'converting' | 'done' | 'error';
     let convert_status_kv: Record<string, ConvertStatus> = $state({});
@@ -87,7 +87,7 @@
                 || event_file_obj.event_presentation_id
                 || event_file_obj.event_id;
             const filename_no_ext = (event_file_obj.filename ?? 'poster_image').replace(/\.pdf$/i, '');
-            const url = `${$ae_api.base_url}/v3/action/hosted_file/${event_file_obj.hosted_file_id}/convert_file`
+            const url = `${$ae_api.base_url}/hosted_file/${event_file_obj.hosted_file_id}/convert_file`
                 + `?link_to_type=${encodeURIComponent(link_to_type)}`
                 + `&link_to_id=${encodeURIComponent(link_to_id)}`
                 + `&filename_no_ext=${encodeURIComponent(filename_no_ext)}`