feat(launcher): Oral/Poster Kiosk mode preset toggle + ae_mode WS command

Adds a two-button Session Mode Preset toggle in Display & App Modes cfg:
- 'Oral / Default' restores all menus/headers/iframe off
- 'Poster Kiosk'   sets iframe=true + hides menu, header, footer

When WS is connected (local_push or remote controller), tapping a preset
sends ae_mode:poster / ae_mode:oral to all connected devices so an operator
can reconfigure the whole room from one device.

ae_mode:{poster|oral} command handler added to handle_ws_recv() in
+layout.svelte — receives and applies the same preset on remote devices.

src/routes/events/[event_id]/(launcher)/cfg_components/launcher_cfg_app_modes.svelte

@@ -1,12 +1,55 @@
 <script lang="ts">
     import { ae_loc } from '$lib/stores/ae_stores';
-    import { events_loc } from '$lib/stores/ae_events_stores';
+    import { events_loc, events_sess } from '$lib/stores/ae_events_stores';
     import Launcher_Cfg_Section from './launcher_cfg_section.svelte';
 
     interface Props {
         on_expand?: () => void;
     }
     let { on_expand }: Props = $props();
+
+    // Poster Kiosk mode presets:
+    //   iframe=true hides global site chrome
+    //   hide__launcher_menu/header/footer removes all launcher panels
+    // Oral/Default restores everything.
+    // WHY: A single tap lets event staff reconfigure a device (or all WS-connected
+    // remote devices) for a session type without touching individual toggles.
+    const POSTER_PRESET = {
+        iframe: true,
+        hide__launcher_menu: true,
+        hide__launcher_header: true,
+        hide__launcher_footer: true
+    };
+    const ORAL_PRESET = {
+        iframe: false,
+        hide__launcher_menu: false,
+        hide__launcher_header: false,
+        hide__launcher_footer: false
+    };
+
+    // Detect current mode: if both iframe AND hide_menu are on, we're in poster mode.
+    // Individual overrides are still possible via the checkboxes below.
+    let is_poster_mode = $derived(
+        $ae_loc.iframe === true && $events_loc.launcher.hide__launcher_menu === true
+    );
+
+    function apply_mode(mode: 'poster' | 'oral') {
+        const preset = mode === 'poster' ? POSTER_PRESET : ORAL_PRESET;
+        $ae_loc.iframe = preset.iframe;
+        $events_loc.launcher.hide__launcher_menu   = preset.hide__launcher_menu;
+        $events_loc.launcher.hide__launcher_header = preset.hide__launcher_header;
+        $events_loc.launcher.hide__launcher_footer = preset.hide__launcher_footer;
+
+        // Push to WS-connected remote devices when we're acting as a controller.
+        // Only send when connected so the UI button doesn't silently no-op.
+        if (
+            $events_loc.launcher.ws_connect &&
+            ($events_loc.launcher.controller === 'local_push' || $events_loc.launcher.controller === 'remote')
+        ) {
+            $events_sess.launcher.controller_cmd = `ae_mode:${mode}`;
+            $events_sess.launcher.controller_trigger_send = 'trigger';
+        }
+    }
 </script>
 
 <Launcher_Cfg_Section
@@ -18,6 +61,38 @@
 >
     <!-- Content omitted for brevity, preserved in file -->
     <div class="col-span-full flex flex-col gap-3">
+        <!-- 0. Oral / Poster Kiosk Mode Preset Toggle -->
+        <div class="flex flex-col gap-1">
+            <p class="text-[9px] font-bold uppercase opacity-50 ml-1">Session Mode Preset</p>
+            <div class="grid grid-cols-2 gap-1 bg-surface-500/5 p-1 rounded-lg">
+                <button
+                    type="button"
+                    onclick={() => apply_mode('oral')}
+                    class="btn btn-xs font-bold text-[10px]"
+                    class:preset-filled-secondary={!is_poster_mode}
+                    class:preset-tonal-surface={is_poster_mode}
+                    title="Standard oral/presentation layout — menus and headers visible"
+                >
+                    <span class="fas fa-chalkboard-teacher mr-1 opacity-70"></span>
+                    Oral / Default
+                </button>
+                <button
+                    type="button"
+                    onclick={() => apply_mode('poster')}
+                    class="btn btn-xs font-bold text-[10px]"
+                    class:preset-filled-primary={is_poster_mode}
+                    class:preset-tonal-surface={!is_poster_mode}
+                    title="Digital Poster kiosk — hides site chrome, menu, header & footer"
+                >
+                    <span class="fas fa-id-badge mr-1 opacity-70"></span>
+                    Poster Kiosk
+                </button>
+            </div>
+            {#if $events_loc.launcher.ws_connect && ($events_loc.launcher.controller === 'local_push' || $events_loc.launcher.controller === 'remote')}
+                <p class="text-[8px] opacity-40 italic ml-1">Applies to all connected WS devices</p>
+            {/if}
+        </div>
+
         <!-- 1. App Mode Selection -->
         <div class="flex flex-col gap-1">
             <p class="text-[9px] font-bold uppercase opacity-50 ml-1"

src/routes/events/[event_id]/(launcher)/launcher/+layout.svelte

@@ -415,6 +415,21 @@
                 else if (zoom_target === 'zoom') modal_zoom_fit = false;
             } else if (cmd.startsWith('ae_refresh:')) {
                 if (cmd.split(':')[1] == 'now') location.reload();
+            } else if (cmd.startsWith('ae_mode:')) {
+                // WHY: Allows a controller to remotely push a display mode preset
+                // (e.g. switch all poster kiosks into kiosk mode without touching each device).
+                const mode_target = cmd.split(':')[1];
+                if (mode_target === 'poster') {
+                    $ae_loc.iframe = true;
+                    $events_loc.launcher.hide__launcher_menu   = true;
+                    $events_loc.launcher.hide__launcher_header = true;
+                    $events_loc.launcher.hide__launcher_footer = true;
+                } else if (mode_target === 'oral') {
+                    $ae_loc.iframe = false;
+                    $events_loc.launcher.hide__launcher_menu   = false;
+                    $events_loc.launcher.hide__launcher_header = false;
+                    $events_loc.launcher.hide__launcher_footer = false;
+                }
             }
         }
     }