Enable Project categorization.

templates/edit_project.html

@@ -41,6 +41,21 @@
                 </select>
             </div>
             
+            <div class="form-group">
+                <label for="category_id">Project Category</label>
+                <select id="category_id" name="category_id">
+                    <option value="">No Category</option>
+                    {% for category in categories %}
+                    <option value="{{ category.id }}" 
+                            {% if (request.form.category_id and request.form.category_id|int == category.id) or (not request.form.category_id and project.category_id == category.id) %}selected{% endif %}>
+                        {{ category.icon or '📁' }} {{ category.name }}
+                    </option>
+                    {% endfor %}
+                </select>
+            </div>
+        </div>
+        
+        <div class="form-row">
             <div class="form-group">
                 <label class="checkbox-label">
                     <input type="checkbox" name="is_active"