Convert Human Era to toggle with implicit API-level date filtering

[Copilot]

The "人类时代" (Human Era) feature previously modified the search query string and force-enabled the advanced search UI. This changes it to a toggle that applies date filtering transparently at the API call level.

Changes

• UI: Button → Switch component with icon/label
• Filtering: Date filter (date < sec(2023-01-01)) now injected in getSearchResults() rather than modifying query state
• URL/Input: Remain clean - filter not visible to user
• Advanced Search: No longer auto-activates when toggle is enabled

Implementation

Extracted filter combination logic to utility function:

// Implicitly adds filter when humanEraEnabled=true
async function getSearchResults(query: string, page: number, sort: Sort, humanEraEnabled: boolean) {
  let finalQuery = query.trim();
  if (humanEraEnabled) {
    finalQuery = addDateFilterToQuery(finalQuery, PRE_2023_DATE_FILTER);
  }
  // API call with finalQuery
}

Filter merges correctly with existing query filters using AND logic.

UI

Toggle OFF (default)

Toggle ON

Result

• User sees: /search?q=技术
• API receives: q=技术 (date < sec(2023-01-01)) when toggle is ON
• Advanced search UI state unchanged

Original prompt

“人类时代”做成开关而不是按钮。并且隐式在执行搜索 API 调用时插入后置的 date 过滤语句，不要向用户自动激活前端的高级搜索按钮。

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