feat(pdf): enable PDF export for research reports

refactor(manager): remove current date context and enhance instructions for time-sensitive queries

refactor(judge): refine evaluation thresholds and incorporate temporal context

feat(assistant): enhance retrieval workflow and clean up agent models

feat(ui): introduce new tab links extension and enable markdown citations

refactor(ui): remove external links extension and adjust reference formatting

feat(ui): add external links extension to markdown rendering

refactor(ui): adjust handle_key_down to invoke State.run_report

refactor(state): simplify report execution by introducing key handler

feat(ui): add enter key support to query input

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