Add clear buttons to bookmarks and highlights panels

- Bookmarks panel: trash icon button clears all bookmarks (updates UI + minimap)
- Highlights panel: 'Clear' button clears active highlight rules without
  touching saved highlight groups — groups are preserved and reloadable

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ozgesolidkey

src/renderer/index.html

@@ -150,6 +150,7 @@
               <button id="btn-save-bookmark-set" class="icon-btn" title="Save as Bookmark Set">&#128230;</button>
               <button id="btn-load-bookmark-set" class="icon-btn" title="Load Bookmark Set">&#128229;</button>
               <button id="btn-export-bookmarks" class="icon-btn" title="Export Bookmarks">&#128190;</button>
+              <button id="btn-clear-bookmarks" class="section-btn" title="Clear all bookmarks">&#128465;</button>
             </div>
             <div id="bookmark-sets-bar" class="bookmark-sets-bar hidden">
               <div id="bookmark-sets-list" class="bookmark-sets-list"></div>
@@ -168,6 +169,9 @@
                 <button id="btn-delete-highlight-group" class="highlight-group-btn danger" title="Delete active group" style="display:none">Del</button>
               </div>
             </div>
+            <div class="section-header-inline" style="padding:4px 8px 0;">
+              <button id="btn-clear-highlights" class="section-btn" title="Clear active highlights (saved groups are kept)">&#128465; Clear</button>
+            </div>
             <div id="highlights-list" class="highlights-content">
               <p class="placeholder">No highlight rules</p>
             </div>

src/renderer/renderer.ts

@@ -13731,6 +13731,16 @@ function init(): void {
 
   // Highlights
   elements.btnAddHighlight.addEventListener('click', showHighlightModal);
+  document.getElementById('btn-clear-highlights')?.addEventListener('click', async () => {
+    if (state.highlights.length === 0) return;
+    await window.api.clearAllHighlights();
+    state.highlights = [];
+    activeHighlightGroupId = null;
+    updateHighlightGroupsUI();
+    updateHighlightsUI();
+    renderVisibleLines();
+    renderMinimapMarkers();
+  });
   elements.btnSaveHighlight.addEventListener('click', saveHighlight);
   elements.btnCancelHighlight.addEventListener('click', hideHighlightModal);
 
@@ -13851,6 +13861,14 @@ function init(): void {
   // Bookmark Sets
   elements.btnSaveBookmarkSet.addEventListener('click', saveBookmarkSet);
   elements.btnLoadBookmarkSet.addEventListener('click', refreshBookmarkSets);
+  document.getElementById('btn-clear-bookmarks')?.addEventListener('click', async () => {
+    if (state.bookmarks.length === 0) return;
+    await window.api.clearBookmarks();
+    state.bookmarks = [];
+    updateBookmarksUI();
+    renderVisibleLines();
+    renderMinimapMarkers();
+  });
 
   // Notes modal
   elements.btnSaveNotes.addEventListener('click', () => hideNotesModal(true));