Add bundles for organizing bookmarks (#1097)

* add bundle model and query logic

* cleanup tests

* add basic form

* add success message

* Add form tests

* Add bundle list view

* fix edit view

* Add remove button

* Add basic preview logic

* Make pagination use absolute URLs

* Hide bookmark edits when rendering preview

* Render bookmark list in preview

* Reorder bundles

* Show bundles in bookmark view

* Make bookmark search respect selected bundle

* UI tweaks

* Fix bookmark scope

* Improve bundle preview

* Skip preview if form is submitted

* Show correct preview after invalid form submission

* Add option to hide bundles

* Merge new migrations

* Add tests for bundle menu

* Improve check for preview being removed

bookmarks/templates/bundles/preview.html

@@ -0,0 +1,12 @@
+<turbo-frame id="preview">
+  {% if bookmark_list.is_empty %}
+    <div>
+      No bookmarks match the current bundle.
+    </div>
+  {% else %}
+    <div class="mb-4">
+      Found {{ bookmark_list.bookmarks_total }} bookmarks matching this bundle.
+    </div>
+    {% include 'bookmarks/bookmark_list.html' %}
+  {% endif %}
+</turbo-frame>