This PR breaks the large web and player bootstrap files into smaller modules with clearer ownership.

Web changes:

Split shared helpers, bootstrap logic, route groups, and upload-sync behavior out of web.js.
Kept web.js focused on wiring and server startup.
Fixed screen playlist reassignment so changing a screen’s playlist now triggers a refresh.
Fixed single-slide playlist refresh behavior so updates do not get stuck behind the current slide.
Player changes:

Split websocket/runtime handling into runtime.js.
Split playlist assembly and revision hashing into playlist.js.
Split onboarding and player HTTP routes into dedicated modules.
Split render utilities and template loading into render-helpers.js.
Kept player.js mostly as startup/orchestration.
Validation:

Rebuilt both services with Docker Compose.
Smoke-checked web and player routes after the refactor.
Verified get_errors was clean on the touched modules.

src/web/views/users/list.hbs

@@ -3,14 +3,17 @@
     <h2>Users</h2>
     <p>Create accounts, rename users, reset passwords, and remove unused logins.</p>
   </div>
-  <div class="page-toolbar">
-    <a class="button-link" href="/admin/users/new">Add user</a>
-  </div>
 </div>
 
-<div class="card">
-  <h3>Existing users</h3>
-  <table class="table-cards users-table">
+<div class="card card-outline card-primary">
+  <div class="card-header">
+    <h3 class="card-title">Existing users</h3>
+    <div class="card-tools">
+      <a class="btn btn-primary btn-sm" href="/admin/users/new">Add user</a>
+    </div>
+  </div>
+  <div class="card-body table-responsive p-0">
+  <table class="table table-striped w-100 mb-0 users-table">
     <thead>
       <tr>
         <th>User</th>
@@ -24,7 +27,6 @@
           <tr>
             <td data-label="User">
               <div class="user-cell">
-                <div class="user-avatar user-avatar--small" aria-hidden="true">{{usernameInitial name}}</div>
                 <div>
                   <strong>{{username}}</strong>
                   {{#if isCurrentUser}}
@@ -43,9 +45,9 @@
             <td data-label="Actions">
               <div class="actions users-row-actions">
                 {{#unless isCurrentUser}}
-                  <a class="button-link list-action" href="/admin/users/{{id}}/edit">Edit</a>
+                  <a class="btn btn-sm btn-primary" href="/admin/users/{{id}}/edit">Edit</a>
                   <form method="post" action="/admin/users/{{id}}/delete" class="inline-form" data-confirm-message="Delete {{username}}?">
-                    <button type="submit" class="button-link list-action is-danger">Delete</button>
+                    <button type="submit" class="btn btn-sm btn-danger">Delete</button>
                   </form>
                 {{else}}
                   <span class="empty">Protected</span>
@@ -59,4 +61,5 @@
       {{/if}}
     </tbody>
   </table>
+  </div>
 </div>