feat: emoji reactions for tasks and comments (#2196)

This PR adds reactions for tasks and comments, similar to what you can do on Gitea, GitHub, Slack and plenty of other tools.

Reviewed-on: https://kolaente.dev/vikunja/vikunja/pulls/2196
Co-authored-by: kolaente <k@knt.li>
Co-committed-by: kolaente <k@knt.li>

frontend/src/views/tasks/TaskDetailView.vue

@@ -312,6 +312,14 @@
 							@update:modelValue="Object.assign(task, $event)"
 						/>
 					</div>
+					
+					<!-- Reactions -->
+					<Reactions 
+						v-model="task.reactions" 
+						entity-kind="tasks"
+						:entity-id="task.id"
+						class="details"
+					/>
 
 					<!-- Attachments -->
 					<div
@@ -616,6 +624,7 @@ import {TASK_REPEAT_MODES} from '@/types/IRepeatMode'
 import {useAuthStore} from '@/stores/auth'
 import {playPopSound} from '@/helpers/playPop'
 import AssigneeList from '@/components/tasks/partials/assigneeList.vue'
+import Reactions from '@/components/input/Reactions.vue'
 
 const {
 	taskId,