Add bookmark item search (#15)

- Implement form styling throughout
- Modify header links for narrower views
- Clean up CSS

src/lib/ItemList.php

@@ -138,13 +138,16 @@ class ItemList {
      * Create an item list with items matching given search terms
      *
      * @param string $search The item search terms / query
+     * @param bool $isBookmarked Whether to restrict the search to bookmarked items
      * @param SQLite3 $db The database connection to use to obtain items
      * @return static An item list match the given search terms
      */
-    public static function matchingSearch(string $search, SQLite3 $db): static {
-        $list = new static($db,
-            self::makeQuery($db, ['item.id IN (SELECT ROWID FROM item_search WHERE content MATCH :search)'],
-                [[':search', $search]]), 'Matching', "/search?search=$search");
+    public static function matchingSearch(string $search, bool $isBookmarked, SQLite3 $db): static {
+        $where   = $isBookmarked ? ['item.is_bookmarked = 1'] : [];
+        $where[] = 'item.id IN (SELECT ROWID FROM item_search WHERE content MATCH :search)';
+        $list = new static($db, self::makeQuery($db, $where, [[':search', $search]]),
+            'Matching' . ($isBookmarked ? ' Bookmarked' : ''),
+            "/search?search=$search&items=" . ($isBookmarked ? 'bookmarked' : 'all'));
         $list->showIndicators = true;
         $list->displayFeed    = true;
         return $list;