feat: 导航栏关注事件弹窗增强显示信息

- 添加热度显示（🔥 图标 + 分数）
  - ≥80 红色，≥60 橙色，<60 灰色
- 添加关注数显示（👥 图标 + 人数）
- 保留原有涨跌幅显示（日均、周涨）
- mock 数据补充涨跌幅字段（related_avg_chg, related_max_chg, related_week_chg）
- 智能显示：字段存在时才显示对应 Badge
- 优化 Badge 间距和布局

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/mocks/data/account.js

@@ -138,6 +138,9 @@ export const mockFollowingEvents = [
     upvote_count: 489,
     heat_score: 95,
     exceed_expectation_score: 85,
+    related_avg_chg: 1.25,
+    related_max_chg: 3.15,
+    related_week_chg: 2.80,
     creator: {
       id: 1001,
       username: '财经分析师',
@@ -155,6 +158,9 @@ export const mockFollowingEvents = [
     upvote_count: 567,
     heat_score: 88,
     exceed_expectation_score: 78,
+    related_avg_chg: 5.60,
+    related_max_chg: 12.50,
+    related_week_chg: 8.90,
     creator: {
       id: 1002,
       username: '科技观察者',
@@ -172,6 +178,9 @@ export const mockFollowingEvents = [
     upvote_count: 345,
     heat_score: 72,
     exceed_expectation_score: 68,
+    related_avg_chg: 2.35,
+    related_max_chg: 6.80,
+    related_week_chg: 4.20,
     creator: {
       id: 1003,
       username: '产业研究员',
@@ -189,6 +198,9 @@ export const mockFollowingEvents = [
     upvote_count: 432,
     heat_score: 80,
     exceed_expectation_score: 72,
+    related_avg_chg: 3.80,
+    related_max_chg: 9.20,
+    related_week_chg: 6.50,
     creator: {
       id: 1004,
       username: '半导体观察',
@@ -206,6 +218,9 @@ export const mockFollowingEvents = [
     upvote_count: 234,
     heat_score: 65,
     exceed_expectation_score: null,
+    related_avg_chg: -0.80,
+    related_max_chg: 2.50,
+    related_week_chg: 1.20,
     creator: {
       id: 1005,
       username: '医药行业专家',