diff --git a/src/lib/stores/ae_events_stores__launcher_defaults.ts b/src/lib/stores/ae_events_stores__launcher_defaults.ts
index d93783d9..d983257f 100644
--- a/src/lib/stores/ae_events_stores__launcher_defaults.ts
+++ b/src/lib/stores/ae_events_stores__launcher_defaults.ts
@@ -7,6 +7,8 @@
  *   launcher_sess_defaults → events_sess.launcher (in-memory, resets on page load)
  */
 
+import type { LaunchProfile } from '$lib/ae_events/ae_launcher__default_launch_profiles';
+
 /** 3-way section collapse state used throughout the Launcher UI. */
 export type SectionState = 'collapsed' | 'auto' | 'pinned';
 
@@ -91,6 +93,18 @@ export interface LauncherLocState {
      * device/OS without deploying to the Mac laptop.
      */
     native_test_mode: boolean;
+    /**
+     * Per-file display mode overrides, keyed by event_file_id.
+     * Stored locally (per-device) because event_file has no cfg_json column yet.
+     * TODO: migrate to event_file.cfg_json once the backend column is added.
+     */
+    file_display_overrides: Record<string, 'extend' | 'mirror' | 'none'>;
+    /**
+     * Local per-device launch profile overrides, keyed by profile/extension name.
+     * Overrides DEFAULT_LAUNCH_PROFILES for this device only.
+     * Priority: device API config > this local override > built-in defaults.
+     */
+    launch_profiles: Record<string, Partial<LaunchProfile>> | null;
 }
 
 export interface LauncherSessState {
@@ -219,7 +233,9 @@ export const launcher_loc_defaults: LauncherLocState = {
     controller_client_id: null,
     native_test_mode: false,
     wallpaper_applied_url: null,
-    wallpaper_applied_url_external: null
+    wallpaper_applied_url_external: null,
+    file_display_overrides: {},
+    launch_profiles: null
     // controller_cmd: null,
     // controller_trigger_send: null,
 };
diff --git a/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte b/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte
index 0a3f7741..464bbc02 100644
--- a/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte
+++ b/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte
@@ -95,10 +95,9 @@ let open_file_error_detail: string | null = $state(null);
 
 let open_in_os_loading: boolean = $state(false);
 
-/** Reactive display override for this file — stored in $events_loc (localStorage) not in the backend. */
+/** Reactive display override for this file — stored locally (per-device) because event_file has no cfg_json column yet. */
 const current_display_override = $derived.by(() => {
-    const overrides = ((launcher_loc.current as Record<string, unknown>)?.file_display_overrides ?? {}) as Record<string, string>;
-    return (overrides[event_file_id] ?? null) as 'extend' | 'mirror' | 'none' | null;
+    return (launcher_loc.current.file_display_overrides[event_file_id] ?? null) as 'extend' | 'mirror' | 'none' | null;
 });
 
 /** State for the native test mode debug popup */
@@ -143,11 +142,9 @@ function get_launch_profile(
         native_device?.launch_profiles ??
         null;
     const local_profiles = launcher_loc.current?.launch_profiles ?? null;
-    // Display override is stored per-device in $events_loc — not in the backend (event_file has no JSON column).
+    // Display override is stored per-device in launcher_loc — not in the backend (event_file has no cfg_json column yet).
     // This is intentional: display mode is a room/device preference, not a global file property.
-    const launcher_kv = launcher_loc.current as Record<string, unknown>;
-    const file_display_overrides = (launcher_kv?.file_display_overrides ?? {}) as Record<string, string>;
-    const display_override = (file_display_overrides[event_file_id] ?? null) as 'extend' | 'mirror' | 'none' | null;
+    const display_override = (launcher_loc.current.file_display_overrides[event_file_id] ?? null) as 'extend' | 'mirror' | 'none' | null;
 
     // open_in_os = 'win' routes to the Windows-variant profile for apps that have one.
     // These profiles target Windows PowerPoint / LibreOffice / Acrobat running via Parallels or CrossOver.
@@ -749,14 +746,13 @@ function prevent_default<T extends Event>(fn: (event: T) => void) {
                 onclick={() => {
                     const cur = current_display_override;
                     const next: 'extend' | 'mirror' | null = !cur ? 'extend' : cur === 'extend' ? 'mirror' : null;
-                    const launcher = launcher_loc.current as Record<string, unknown>;
-                    const new_overrides = { ...((launcher?.file_display_overrides ?? {}) as Record<string, string>) };
+                    const new_overrides = { ...launcher_loc.current.file_display_overrides };
                     if (next === null) {
                         delete new_overrides[event_file_id];
                     } else {
                         new_overrides[event_file_id] = next;
                     }
-                    launcher.file_display_overrides = new_overrides;
+                    launcher_loc.current.file_display_overrides = new_overrides;
                 }}
                 class="btn btn-sm transition-all"
                 class:preset-tonal-primary={current_display_override === 'extend'}