[Launcher] Add accessibility controls + doc comments to sidebar menu

- New: menu_launcher_controls.svelte — bottom control bar for the launcher
  sidebar with font size cycler (A / A+ / A−) and light/dark mode toggle,
  always visible regardless of access level; visibility toggles (All Files /
  All Sessions) moved here from launcher_menu.svelte and restyled to
  preset-tonal-tertiary with descriptive title attributes
- launcher_menu.svelte — replace inline visibility-toggle block with
  <Menu_launcher_controls />; add full header doc-comment describing
  component structure and data flow
- menu_location_list.svelte — add header doc-comment covering purpose,
  visibility rules, data flow, and the intentional non-bindable prop pattern
- documentation/TODO__Agents.md — mark font size cycler task complete

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

@@ -1,4 +1,39 @@
 <script lang="ts">
+    /**
+     * launcher_menu.svelte — Aether Launcher: Sidebar Menu Container
+     *
+     * PURPOSE:
+     *   The main sidebar panel for the Aether Events Launcher. Composes all menu
+     *   sub-components into a single vertical column and passes data down from the
+     *   parent layout. This is intentionally a thin coordinator — business logic lives
+     *   in the individual sub-components and the layout's liveQuery / effect layer.
+     *
+     * STRUCTURE (top to bottom):
+     *   1. Event-level files  (lq__event_event_file_obj_li)
+     *      Files attached directly to the event (e.g. a shared opening slide deck).
+     *      Shown regardless of which room/session is selected.
+     *
+     *   2. Location selector  (Menu_location_list_menu — edit mode only)
+     *      Dropdown that lets operators switch the active room. Triggers a session
+     *      list reload and navigates the URL to /launcher/{location_id}.
+     *
+     *   3. Location-level files  (lq__location_event_file_obj_li)
+     *      Files attached to the selected room — e.g. A/V setup guides, room schedules.
+     *      Hidden until a room is selected.
+     *
+     *   4. Session list  (Menu_session_list_menu)
+     *      Compact button list of all sessions in the selected room. Operators click
+     *      to switch the active session; hover pre-loads after a delay timer.
+     *
+     *   5. Launcher controls  (Menu_launcher_controls)
+     *      Bottom bar for accessibility and visibility settings: font size cycler,
+     *      light/dark toggle, and (edit mode only) show/hide draft files/sessions.
+     *
+     * DATA FLOW:
+     *   All liveQuery stores (lq__*) are passed in from +layout.svelte and originate
+     *   from Dexie IndexedDB — never fetched directly here. Selection state is
+     *   coordinated via $events_slct / $events_loc stores.
+     */
     interface Props {
         lq__event_obj: any;
 
@@ -84,6 +119,7 @@
     import Event_launcher_file_cont from './launcher_file_cont.svelte';
     import Menu_location_list_menu from './menu_location_list.svelte';
     import Menu_session_list_menu from './menu_session_list.svelte';
+    import Menu_launcher_controls from './menu_launcher_controls.svelte';
 
     // *** Functions and Logic
 
@@ -214,67 +250,5 @@
         />
     {/if}
 
-    {#if $ae_loc.edit_mode}
-        <div
-            class="
-        w-full max-w-full
-        flex flex-row gap-1 items-center justify-center
-        "
-        >
-            <button
-                type="button"
-                onclick={() => {
-                    if ($events_loc.launcher.show_content__hidden_files) {
-                        $events_loc.launcher.show_content__hidden_files = false;
-                        $events_loc.launcher.hide_content__draft_files = true;
-                    } else {
-                        $events_loc.launcher.show_content__hidden_files = true;
-                        $events_loc.launcher.hide_content__draft_files = false;
-                    }
-                }}
-                class="
-            btn btn-sm
-            text-xs
-            w-1/2 max-w-1/2
-            preset-tonal-warning
-            hover:preset-tonal-success
-            transition-all
-            "
-                title="Toggle showing hidden files. Including files marked as 'draft'."
-            >
-                {#if $events_loc.launcher.show_content__hidden_files}
-                    <span class="fas fa-eye-slash m-1 text-neutral-800/80"
-                    ></span>
-                    Hide Files
-                {:else}
-                    <span class="fas fa-eye m-1 text-neutral-800/80"></span>
-                    All Files
-                {/if}
-            </button>
-            <button
-                type="button"
-                onclick={() => {
-                    $events_loc.launcher.show_content__hidden_sessions =
-                        !$events_loc.launcher.show_content__hidden_sessions;
-                }}
-                class="
-            btn btn-sm
-            text-xs
-            w-1/2 max-w-1/2
-            preset-tonal-warning
-            hover:preset-tonal-success
-            transition-all
-            "
-            >
-                {#if $events_loc.launcher.show_content__hidden_sessions}
-                    <span class="fas fa-eye-slash m-1 text-neutral-800/80"
-                    ></span>
-                    Hide Sessions
-                {:else}
-                    <span class="fas fa-eye m-1 text-neutral-800/80"></span>
-                    All Sessions
-                {/if}
-            </button>
-        </div>
-    {/if}
+    <Menu_launcher_controls />
 </div>