Remove icons from page title bars and fix Features page issues

- Remove icons from all page title sections in tab bars
- Fix double padding on mobile for Features page
- Fix drag state not resetting when Apply/Cancel pressed

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/pages/Feature2.tsx

@@ -14,7 +14,6 @@ export default function Feature2() {
             <span className="material-symbols-outlined">menu</span>
           </button>
           <div className="page-title-section">
-            <span className="material-symbols-outlined">download</span>
             <span className="page-title-text">{t.features.feature2}</span>
           </div>
         </div>