ui: replace inline state styles with css classes

apps/ui/html/wizard/index.html

@@ -201,7 +201,7 @@
     <div class="action-bar" role="toolbar" aria-label="Wizard navigation">
       <div class="action-bar-inner">
 
-        <button class="btn btn-back" type="button" disabled style="opacity: 0.35; cursor: not-allowed;">
+        <button class="btn btn-back" type="button" disabled>
           <svg width="13" height="13" viewBox="0 0 16 16" fill="currentColor">
             <path d="M9.78 12.78a.75.75 0 01-1.06 0L4.47 8.53a.75.75 0 010-1.06l4.25-4.25a.75.75 0 011.06 1.06L6.06 8l3.72 3.72a.75.75 0 010 1.06z"/>
           </svg>

apps/ui/html/workspace-setup.html

@@ -286,7 +286,7 @@
       <!-- ── Actions ── -->
       <div class="ws-setup-actions">
         <a href="javascript:history.back()" class="btn-ghost-sm" style="padding:9px 18px;font-size:13px;text-decoration:none;color:var(--text-secondary);" data-i18n="btn.cancel">Cancel</a>
-        <button class="btn-primary" id="submit-btn" type="button" onclick="submitForm()" style="padding:9px 22px;font-size:13px;" data-i18n="workspace_setup.actions.save">Save changes</button>
+        <button class="btn-primary ws-submit-btn" id="submit-btn" type="button" onclick="submitForm()" data-i18n="workspace_setup.actions.save">Save changes</button>
       </div>
 
       <div class="ws-setup-footer-note" id="footer-note" style="display:none;">