fix(Community): 优化搜索和时间筛选交互

- 搜索框添加清空按钮（allowClear）
- 自定义时间范围限制不能超过当前时间（精确到分钟）
- 相关概念移除"相关度"显示

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

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

src/views/EventDetail/components/RelatedConcepts.js

@@ -86,15 +86,6 @@ const ConceptCard = ({ concept, tradingDate, onViewDetails }) => {
                                     {concept.concept}
                                 </Text>
                                 <HStack spacing={2} flexWrap="wrap">
-                                    <Badge
-                                        bg="rgba(168, 85, 247, 0.15)"
-                                        color="#A855F7"
-                                        borderWidth="1px"
-                                        borderColor="#A855F7"
-                                        fontSize="xs"
-                                    >
-                                        相关度: {concept.score.toFixed(2)}
-                                    </Badge>
                                     <Badge
                                         bg="rgba(20, 184, 166, 0.15)"
                                         color="#14B8A6"
@@ -618,9 +609,6 @@ const RelatedConcepts = ({ eventTitle, eventTime, eventId, loading: externalLoad
                             <VStack align="start" spacing={1}>
                                 <Text fontSize="xl">{selectedConcept?.concept}</Text>
                                 <HStack spacing={2}>
-                                    <Badge colorScheme="purple">
-                                        相关度: {selectedConcept?.score?.toFixed(2)}
-                                    </Badge>
                                     <Badge colorScheme="teal">
                                         {selectedConcept?.stock_count} 只股票
                                     </Badge>