enhance: allow built-in pages to be renamed

`db/ident` shouldn't be updated, at least for those built-in pages.

src/main/frontend/common.css

@@ -319,17 +319,13 @@ i.ti {
 /** endregion **/
 
 /* region FIXME: override elements (?) */
-h1.title, h1.title input, .ls-page-title-container, .ls-page-icon {
+h1.title, h1.title input, .ls-page-title-container {
   @apply font-medium;
 
   color: var(--lx-gray-12, var(--ls-title-text-color, hsl(var(--foreground))));
   font-size: var(--ls-page-title-size, 32px);
 }
 
-.title .page-icon {
-  margin-right: 12px;
-}
-
 .block-highlight,
 .content .selected {
   transition: background-color 0.2s cubic-bezier(0, 1, 0, 1);

src/main/frontend/components/block.cljs

@@ -3106,7 +3106,7 @@
                                    (when (ldb/property? block)
                                      {:type :tabler-icon
                                       :id "letter-p"}))))]
-        [:div {:class (when (:page-title? config) "ls-page-icon")}
+        [:div.flex.items-center.page-icon
          (icon-component/icon-picker icon
                                     {:on-chosen (fn [_e icon]
                                                   (db-property-handler/set-block-property!

src/main/frontend/handler/page.cljs

@@ -149,8 +149,6 @@
                     (outliner-op/rename-page! page-uuid new-name))
             result' (ldb/read-transit-str result)]
       (case (if (string? result') (keyword result') result')
-        :built-in-page
-        (notification/show! "Built-in page's name cannot be modified" :warning)
         :invalid-empty-name
         (notification/show! "Please use a valid name, empty name is not allowed!" :warning)
         :rename-page-exists

src/main/frontend/worker/handler/page/db_based/rename.cljs

@@ -81,9 +81,6 @@
           new-page-exists?
           :rename-page-exists
 
-          (ldb/built-in? page-e)
-          :built-in-page
-
           (and old-name new-name name-changed?)
           (if (= old-page-name new-page-name) ; case changed
             (ldb/transact! conn