[style](trx-frontend): remove bookmark side shading

Co-authored-by: OpenAI Codex <codex@openai.com>

Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html

@@ -46,6 +46,7 @@
             <option value="contrast">Contrast</option>
             <option value="neon-disco">Neon Disco</option>
             <option value="golden-rain">Donald</option>
+            <option value="fire">Fire</option>
           </select>
         </div>
         <button id="theme-toggle" class="header-bar-btn" type="button" aria-label="Toggle dark or light theme">Light</button>
@@ -273,6 +274,9 @@
         <select id="bm-category-filter" class="status-input" aria-label="Filter by category">
           <option value="">All categories</option>
         </select>
+        <select id="bm-mode-filter" class="status-input" aria-label="Filter by mode">
+          <option value="">All modes</option>
+        </select>
         <input type="search" id="bm-text-filter" class="status-input" placeholder="Search bookmarks…" aria-label="Search bookmarks" />
         <button id="bm-add-btn" type="button" class="bm-add-btn" style="display:none;">+ Add Bookmark</button>
       </div>