feat(launcher): configurable launch scripts + composable native primitives

- electron_relay: type launch_from_cache with script_template param;
  add copy_from_cache_to_temp export; add JSDoc for run_osascript hardening
- launcher_file_cont: add get_launch_script_template() helper reading from
  device-level (event_device.data_json.launch_scripts) and event-level
  (events_loc.launcher.launch_scripts) config; wire into handle_open_file()
- PROJECT__AE_Events_Launcher_Native_integration.md: add Section 8
  (Configurable Launch Scripts); update IPC reference for new/changed handlers
- MODULE__AE_Events_PressMgmt_Launcher.md: add configurable launch behavior
  note to Native Mode Safe Handover section

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

@@ -88,6 +88,41 @@ let open_file_status_message: null | string = $state(null);
 
 let screen_saver_exts = ['jpg', 'png', 'PNG', 'webp'];
 
+/**
+ * Resolves a data-driven launch script template for a given file extension.
+ * Checked in priority order:
+ *   1. event_device.data_json.launch_scripts  (API-driven, per-device, most specific)
+ *   2. $events_loc.launcher.launch_scripts     (local persistent override)
+ * Keys are lowercase extensions without the dot ("pptx", "key", "pdf", etc.).
+ * A "default" key acts as a catch-all for unrecognised extensions.
+ *
+ * Returns null when no config is found → Electron falls back to its hardcoded defaults.
+ *
+ * Template formats:
+ *   - AppleScript (macOS): plain string with {{path}} placeholder
+ *   - Shell command:        prefix with "shell:" → "shell:open \"{{path}}\""
+ */
+function get_launch_script_template(extension: string): string | null {
+    const ext = (extension || '').toLowerCase().replace('.', '');
+
+    // 1. Device-level config (from API, per device — highest priority)
+    const device_scripts = ($ae_loc as any).native_device?.launch_scripts;
+    if (device_scripts) {
+        if (device_scripts[ext]) return device_scripts[ext];
+        if (device_scripts['default']) return device_scripts['default'];
+    }
+
+    // 2. Launcher local config override (set manually via Launcher config UI)
+    const local_scripts = ($events_loc as any).launcher?.launch_scripts;
+    if (local_scripts) {
+        if (local_scripts[ext]) return local_scripts[ext];
+        if (local_scripts['default']) return local_scripts['default'];
+    }
+
+    // 3. No override — let Electron use its built-in hardcoded defaults
+    return null;
+}
+
 onMount(() => {
     if (screen_saver_exts.includes(event_file_obj.extension)) {
         if (!$events_loc.launcher.screen_saver_img_kv)
@@ -149,11 +184,14 @@ async function handle_open_file() {
         // Phase 2/5: Use the atomic copy-and-launch operation.
         // The main process handler (file_handlers.ts) now handles the
         // specialized LibreOffice/AppleScript logic internally after copying.
+        // script_template is null when no device/local config exists → Electron uses hardcoded defaults.
+        const script_template = get_launch_script_template(event_file_obj.extension);
         const launch_result = await native.launch_from_cache({
             cache_root,
             hash: event_file_obj.hash_sha256,
             temp_root,
-            filename: event_file_obj.filename
+            filename: event_file_obj.filename,
+            script_template
         });
 
         if (!launch_result.success) {