fixed implementation of UGC content uploader

nonpacks/templates/library/_project_form_side.html

@@ -0,0 +1,17 @@
+<div class="form-group">
+    {{ form.thumbnail.errors }}
+    <label for="{{ form.thumbnail.id_for_label }}">Thumbnail</label>
+    {{ form.thumbnail }}
+    <p class="bio-help"><i class="fas fa-info-circle"></i> Square image shown on cards and the project header.</p>
+</div>
+
+<div class="form-group">
+    <label>Tags</label>
+    <div class="tag-editor">
+        <input type="text" id="tag-input" placeholder="Type a tag and press Enter… (e.g. content:threesome, species:dragon)" autocomplete="off">
+        <div class="tag-suggestions" id="tag-suggestions" hidden></div>
+        <div class="tag-chips" id="tag-chips"></div>
+        {{ form.tags }}
+    </div>
+    <p class="bio-help"><i class="fas fa-info-circle"></i> Categories: loader, version, general, creator, content, species, non_version. Unprefixed tags go to General. Creator tags are added automatically.</p>
+</div>