fix: extend poster session type context to all file list wrapper contexts

element_manage_event_file_li_all.svelte — also derives context_session_type_code
via Dexie chain (event_presentation → session, or event_presenter → presentation →
session) and passes it to element_manage_event_file_li. Fixes the button not showing
when viewing a presenter's files from the session view.

element_manage_event_file_li_direct.svelte — extends the Dexie chain to also handle
event_session (direct lookup) and event_presentation, not just event_presenter.

Both: correct API URL to /v3/hosted_file/ per backend agent's examples.

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

src/lib/elements/element_manage_event_file_li.svelte

@@ -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}/v3/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)}`

src/lib/elements/element_manage_event_file_li_all.svelte

@@ -38,6 +38,31 @@
     ae_tmp.show__direct_download = false;
     // let ae_triggers: key_val = {};
 
+    // WHY: v_event_file joins event_session only via event_file.event_session_id.
+    // For files linked to a presentation or presenter, event_session_id is NULL on
+    // the file record itself, so event_session_type_code is always NULL from the API.
+    // Derive the session type from Dexie: presentation → event_session_id → type_code,
+    // or presenter → event_presentation_id → event_session_id → type_code.
+    let lq__context_session_type_code = $derived(
+        liveQuery(async () => {
+            if (link_to_type === 'event_presentation' && link_to_id) {
+                const presentation = await db_events.presentation.get(link_to_id);
+                if (!presentation?.event_session_id) return null;
+                const session = await db_events.session.get(presentation.event_session_id);
+                return session?.type_code ?? null;
+            }
+            if (link_to_type === 'event_presenter' && link_to_id) {
+                const presenter = await db_events.presenter.get(link_to_id);
+                if (!presenter?.event_presentation_id) return null;
+                const presentation = await db_events.presentation.get(presenter.event_presentation_id);
+                if (!presentation?.event_session_id) return null;
+                const session = await db_events.session.get(presentation.event_session_id);
+                return session?.type_code ?? null;
+            }
+            return null;
+        })
+    );
+
     let dq__where_val = $derived(`${link_to_type}_id`);
     let dq__where_eq_val = $derived(link_to_id);
 
@@ -74,4 +99,5 @@
     {allow_moderator}
     {container_class_li}
     {display_mode}
+    context_session_type_code={$lq__context_session_type_code ?? null}
 />

src/lib/elements/element_manage_event_file_li_direct.svelte

@@ -49,13 +49,26 @@
     // Sessions are guaranteed in Dexie because the pres_mgmt layout loads inc_session_li:true.
     let lq__context_session_type_code = $derived(
         liveQuery(async () => {
-            if (link_to_type !== 'event_presenter' || !link_to_id) return null;
-            const presenter = await db_events.presenter.get(link_to_id);
-            if (!presenter?.event_presentation_id) return null;
-            const presentation = await db_events.presentation.get(presenter.event_presentation_id);
-            if (!presentation?.event_session_id) return null;
-            const session = await db_events.session.get(presentation.event_session_id);
-            return session?.type_code ?? null;
+            if (!link_to_id) return null;
+            if (link_to_type === 'event_session') {
+                const session = await db_events.session.get(link_to_id);
+                return session?.type_code ?? null;
+            }
+            if (link_to_type === 'event_presentation') {
+                const presentation = await db_events.presentation.get(link_to_id);
+                if (!presentation?.event_session_id) return null;
+                const session = await db_events.session.get(presentation.event_session_id);
+                return session?.type_code ?? null;
+            }
+            if (link_to_type === 'event_presenter') {
+                const presenter = await db_events.presenter.get(link_to_id);
+                if (!presenter?.event_presentation_id) return null;
+                const presentation = await db_events.presentation.get(presenter.event_presentation_id);
+                if (!presentation?.event_session_id) return null;
+                const session = await db_events.session.get(presentation.event_session_id);
+                return session?.type_code ?? null;
+            }
+            return null;
         })
     );
 

src/routes/events/ae_comp__event_file_obj_tbl.svelte

@@ -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}/v3/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)}`