[codex] Fix JUST-OS citation links

[LukasWallrich]

Summary

• renumber inline JUST-OS citations when chunk references are deduplicated by source
• make inline citations clickable and show the full supporting chunk in a tooltip
• preserve the existing collapsible bibliography, copied references, and chat-history behavior

Root cause

The FORRT chatbot deduplicated the bibliography by source URL but left the inline chunk-level citation numbers unchanged. This could display citations such as [4] and [5] even when the bibliography contained only three source entries. The backend already embeds the supporting chunk and source metadata in each citation link, but the FORRT client disabled those links.

Validation

• node --check static/js/just-os-chat.js
• git diff --check --cached
• focused source-level renumbering fixture: [1] [2] [3] [4] [5] becomes [1] [2] [1] [3] [2] with three references
• browser fixture verified that clicking a citation opens the supporting chunk and source link, and clicking outside closes the tooltip

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[github-actions]

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