[ishan-jawale]

Summary

Make the source popup easier to read while an answer is being generated. Students can see the original question, keep a passage open when the answer arrives, and return to the cited passage or PDF page without losing their place.

Key changes

• Add a shared source header with section and document titles, an expandable question, collapsible source details, and Keep open and Return to chat controls.
• Show the correct question and generation status when reopening sources, navigating between documents, simplifying earlier answers, or retrying with reasoning.
• Preserve the mounted reader, scroll position, and PDF keyboard focus when retained; reject late document loads after dismissal, cancellation, or completion.
• Add Jump to passage and Back to cited page controls, distinguish PDF search matches from page navigation, and support both themes and narrow layouts.
• Update popup lifecycle tests, source-reader browser checks, the manual preview fixture, and test instructions for current main.

Main implementation: App.tsx, MarkdownSourceViewer.tsx, SourceViewerHeader.tsx, answer-source-preview.ts, hooks/useAnswerSourcePreview.ts, and source-viewer.css.

Testing

• npm run build passed, including Node and renderer TypeScript checks and all application bundles.
• npm run test:unit:ts: 370 passed.
• npm run test:unit:python: 115 passed.
• npm run test:integration: 16/16 conversation pipeline contracts and Python worker/PDF integration passed.
• All 12 browser suites passed, covering source preview, query plans, sidebar, study workspace, practice, scrolling, source access, model selection, and cloud connections.
• 14 additional source scenarios passed: delayed loads, Stop, failures, Settings navigation, mixed Markdown/PDF navigation, destination failure, dismissal during loading, and phone layouts.
• git diff --check upstream/main...HEAD passed.
• For the wording-only follow-up, both TypeScript checks and all 21 targeted source-reader tests passed. A compiled-output comparison confirmed that the changes preserve the logic.

Notes

• Integrated upstream main at c7fa02f and resolved conflicts in the main screen and test documentation while preserving the shared sidebar and query-plan behavior.

Screenshot

Source reader showing the original question and highlighted BuzzDB passage.