refactor: move bookmark refresh button to footer with view controls

- Remove separate refresh section from bookmarks list
- Add refresh button to view-mode-controls footer
- Show last update time in button tooltip instead of inline text
- Cleaner UI with all controls in one footer section

src/components/BookmarkList.tsx

@@ -161,37 +161,20 @@ export const BookmarkList: React.FC<BookmarkListProps> = ({
               />
             )}
           </div>
-          {onRefresh && (
-            <div className="refresh-section" style={{
-              display: 'flex',
-              alignItems: 'center',
-              justifyContent: 'center',
-              gap: '0.5rem',
-              padding: '1rem',
-              marginTop: '1rem',
-              borderTop: '1px solid var(--border-color)',
-              fontSize: '0.85rem',
-              color: 'var(--text-secondary)'
-            }}>
-              <IconButton
-                icon={faRotate}
-                onClick={onRefresh}
-                title="Refresh bookmarks"
-                ariaLabel="Refresh bookmarks"
-                variant="ghost"
-                disabled={isRefreshing}
-                spin={isRefreshing}
-              />
-              {lastFetchTime && (
-                <span>
-                  Updated {formatDistanceToNow(lastFetchTime, { addSuffix: true })}
-                </span>
-              )}
-            </div>
-          )}
         </div>
       )}
       <div className="view-mode-controls">
+        {onRefresh && (
+          <IconButton
+            icon={faRotate}
+            onClick={onRefresh}
+            title={lastFetchTime ? `Refresh bookmarks (updated ${formatDistanceToNow(lastFetchTime, { addSuffix: true })})` : 'Refresh bookmarks'}
+            ariaLabel="Refresh bookmarks"
+            variant="ghost"
+            disabled={isRefreshing}
+            spin={isRefreshing}
+          />
+        )}
         <IconButton
           icon={faList}
           onClick={() => onViewModeChange('compact')}