Fixed Event File data mapping for V3 API and updated AGENT_TODO.

Mapped prefixed backend fields 'hosted_file_hash_sha256' and 'hosted_file_size' to flat 'hash_sha256' and 'file_size' properties in the Event File data layer. This resolves component crashes (TypeError: slice on null) by ensuring IndexedDB is populated with valid hash strings.

Updated AGENT_TODO.md to reflect recently completed tasks.

documentation/AGENT_TODO.md

@@ -8,12 +8,12 @@
 - [ ] **Step 3:** Implement formal error boundaries for 403/401 API responses to provide user-friendly "Session Expired" or "Access Denied" UI.
 
 ## 🚧 Upcoming High Priority
-- **event_session Search Fix:** Investigate 400 error (`Unauthorized search field 'account_id'`) on `event_session/search`.
-- **Badge Rendering Fix:** Refactor `badge_template` lookup to use V3 Triple ID pattern.
 - **CRUD v2 Refactor:** Finalize retirement of `Element_ae_crud_v2.svelte` in favor of V3 Editor.
 - **Temp Cleanup:** Auto-removal of native `.tmp` files older than 24h.
 
 ## ✅ Completed Recently
+- [x] **[UI]** **Badge Rendering Fix:** Refactored `badge_template` lookup to use V3 Triple ID pattern.
+- [x] **[API]** **event_session Search Fix:** Resolved 400 error (`Unauthorized search field 'account_id'`) via backend update.
 - [x] **[Security]** Purged redundant `x-aether-api-token` from frontend and notified backend.
 - [x] **[Security]** Fixed misplaced `Access-Control-Allow-Origin` request headers.
 - [x] **[Security]** Implemented "Account ID Scavenging" to fix hydration race conditions.

src/lib/ae_events/ae_events__event_file.ts

@@ -555,6 +555,14 @@ export async function process_ae_obj__event_file_props({
         obj_type: 'event_file',
         log_lvl,
         specific_processor: (obj) => {
+            // SYNC: Map prefixed Hosted File fields to flat names for UI consistency
+            if (obj.hosted_file_hash_sha256 && !obj.hash_sha256) {
+                obj.hash_sha256 = obj.hosted_file_hash_sha256;
+            }
+            if (obj.hosted_file_size && !obj.file_size) {
+                obj.file_size = obj.hosted_file_size;
+            }
+
             // SYNC: Ensure for_id matches the specific object ID it was linked to
             if (obj.for_type && !obj.for_id) {
                 const specific_id_key = `${obj.for_type}_id`;