Sync AOT caching preview with updated detail page flags

[Copilot]

The AOT class preloading detail page was updated with new JVM flags (-XX:AOTCacheOutput, -XX:AOTCache), but the preview card and search data still referenced deprecated flags, causing preview/detail mismatch.

Changes

Updated two data sources to match the detail page:

• data/snippets.json - Updated modernCode field with correct flags
• index.html - Updated hardcoded preview card HTML

Flag Changes

# Training run
- $ java -XX:AOTMode=record \
-     -XX:AOTConfiguration=app.aotconf \
+ $ java -XX:AOTCacheOutput=app.aot \
      -cp app.jar com.App

# Production
- $ java -XX:AOTMode=on \
-     -XX:AOTCache=app.aot \
+ $ java -XX:AOTCache=app.aot \
      -cp app.jar com.App

Verification

Detail page:

Preview card:

Architecture Note

Site uses three independent data sources that must be kept in sync:

1. Detail page HTML files (standalone)
2. Preview cards in index.html (hardcoded)
3. data/snippets.json (search index)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Fixing AOT Caching preview</issue_title>
<issue_description>After updating the AOT Caching site, the main preview page was not refreshed and now shows outdated content.

Investigate and fix the issue so that preview pages always stay consistent with their corresponding detail pages.

Requirements:

• Ensure previews automatically update whenever a detail page is updated.
• Identify where preview data is generated or cached and correct any invalidation or refresh logic.
• Verify that AOT caching does not serve stale preview content.
• Add safeguards or tests to prevent preview/detail mismatches in the future.
• Keep performance impact minimal and preserve existing caching benefits.

Expected outcome:

• The main preview page and all preview components display the same updated data as the detail pages immediately after updates.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fixing AOT Caching preview #9

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