fix(reaction): fix disabled-tooltip hover and post-AC dialog copy

- SubmitCode.vue: AC dialog title still told students to '打星
  评分' after the reaction UI moved to emoji buttons. Rewritten to
  match the emoji-based interaction, with no star/rating language.
- ProblemReaction.vue: n-tooltip's hover trigger merges its
  mouseenter/mouseleave onto the single root element of the trigger
  slot. That root was an n-button, and disabled form controls never
  dispatch mouse events, so the two disabled-state tooltips ('完成本题后可以评价'
  and the max-selection message) never appeared. Wrap each button in
  a non-disabled <span> and make that the tooltip root so hover
  events fire regardless of the button's disabled state.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/oj/problem/components/SubmitCode.vue

@@ -259,7 +259,7 @@ watch(
   <!-- 评价弹窗 -->
   <n-modal
     preset="card"
-    title="恭喜你成功提交，请对该题进行评价（一星差评，五星好评）"
+    title="恭喜你成功提交，说说你对这道题的感受吧"
     :mask-closable="false"
     :style="{ maxWidth: isDesktop && '50vw', maxHeight: '80vh' }"
     v-model:show="commentPanel"