Phase 3.2: PreviewPanel multi-tab#72

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baochipham942-eng wants to merge 4 commits intophase3-multi-previewfrom

phase3-2-preview-tabs

Commits on Apr 22, 2026

refactor(preview): tab-aware store model + panel reads active tab

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feat(preview): multi-tab UI with PreviewTabs bar

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feat(preview): LRU eviction at max 8 tabs + tests

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fix(chat): offer in-app preview for md/csv/tsv/txt, not only html

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