fix(pres_mgmt): use tmp_sort_2 for presentation sort in Pres Mgmt and Launcher

Compute presentation-specific tmp_sort_1/tmp_sort_2 in specific_processor,
overriding the generic values from _process_generic_props which had two bugs:
- priority encoded as 0/1 ASC (backwards — true should sort first)
- sort stored as unpadded string ("10" < "2" lexicographically)
- start_datetime and code not included (presentation-specific fields)

New encoding: priority(inv)_sort(8-padded)_start_datetime_code[_name]
Both liveQueries (Pres Mgmt session page, Launcher session view) now use
.sortBy('tmp_sort_2') — cleaner and uses the indexed field.

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

src/lib/ae_events/ae_events__event_presentation.ts

@@ -680,6 +680,20 @@ export async function process_ae_obj__event_presentation_props({
             if (obj.event_session_id_random)
                 obj.event_session_id = obj.event_session_id_random;
             if (obj.event_id_random) obj.event_id = obj.event_id_random;
+
+            // Override generic tmp_sort_* with presentation-specific encoding.
+            // WHY: Generic _process_generic_props encodes priority as 0/1 ASC (backwards)
+            // and sort as an unpadded string ("10" < "2"). Presentations also need
+            // start_datetime and code in the sort chain, which are not generic fields.
+            // Desired order: priority DESC → sort ASC → start_datetime ASC → code ASC → name ASC
+            // Encoding trick: invert priority so true→'0' sorts before false→'1' ascending.
+            const p = obj.priority ? '0' : '1';
+            const s = String(Number(obj.sort ?? 0)).padStart(8, '0');
+            const dt = obj.start_datetime ?? '';
+            const code = obj.code ?? '';
+            const name = obj.name ?? '';
+            obj.tmp_sort_1 = `${p}_${s}_${dt}_${code}`;
+            obj.tmp_sort_2 = `${p}_${s}_${dt}_${code}_${name}`;
             return obj;
         }
     });