ux: remove remaining btn-* hooks

frontend/src/pages/admin/plugins.astro

@@ -212,20 +212,6 @@ import { API_BASE } from '../../lib/api';
     opacity: 0.5;
   }
 
-  .btn-config {
-    padding: 0.5rem 0.75rem;
-    background: transparent;
-    border: 1px solid var(--border-color);
-    border-radius: 0.5rem;
-    color: var(--text-primary);
-    cursor: pointer;
-    font-size: 0.85rem;
-  }
-
-  .btn-config:hover {
-    background: var(--bg-hover);
-  }
-
   .loading {
     text-align: center;
     padding: 2rem;

frontend/src/pages/communities/[slug]/plugins.astro

@@ -125,7 +125,7 @@ const { slug } = Astro.params;
           <p class="settings-hint">No schema defined. Edit raw JSON:</p>
           <textarea class="settings-json" spellcheck="false" data-name="${escapeHtml(pluginName)}">${escapeHtml(settingsText)}</textarea>
           <div class="settings-actions">
-            <button class="ui-btn ui-btn-primary btn-save-json" data-name="${escapeHtml(pluginName)}">Save Settings</button>
+            <button class="ui-btn ui-btn-primary js-save-json" data-name="${escapeHtml(pluginName)}">Save Settings</button>
             <span class="status" id="status-${escapeHtml(pluginName)}"></span>
           </div>
         </div>
@@ -247,7 +247,7 @@ const { slug } = Astro.params;
       });
     });
 
-    document.querySelectorAll('.btn-save-json').forEach(el => {
+    document.querySelectorAll('.js-save-json').forEach(el => {
       el.addEventListener('click', async (e) => {
         const btn = e.target;
         const pluginName = btn.dataset.name;

frontend/src/pages/proposals/[id].astro

@@ -866,11 +866,6 @@ const proposalId = id ?? '';
     margin-top: 1.5rem;
   }
 
-  .btn-vote:disabled {
-    opacity: 0.5;
-    cursor: not-allowed;
-  }
-
   .voting-method-label {
     font-size: 0.875rem;
     color: var(--color-text-muted);