Added ability to export conversations & set retention policies

[eldong]

This PR also includes the feature to allow users to set the group and workspace retention policies

[Copilot]

Pull request overview

This pull request adds a conversation export feature that allows users to export their conversations in JSON or Markdown format, with options for single-file or ZIP packaging. The export wizard provides a multi-step interface for selecting conversations, choosing formats, and downloading the results.

However, the PR contains significant unrelated changes including:

• Retention policy settings UI for public and group workspaces
• MIME type registration for font files
• Custom logo image files

Changes:

• Added conversation export backend endpoint with sanitization and active thread filtering
• Implemented multi-step export wizard with Bootstrap modal UI
• Added export buttons to conversation lists and sidebar with selection mode support
• Included functional tests validating export logic and feature documentation

Reviewed changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
functional_tests/test_conversation_export.py	Comprehensive tests for export sanitization, markdown generation, ZIP packaging, and active thread filtering
docs/explanation/features/CONVERSATION_EXPORT.md	Complete feature documentation covering architecture, usage, and security
application/single_app/route_backend_conversation_export.py	Backend API endpoint with conversation/message sanitization and format conversion
application/single_app/app.py	Route registration for export endpoint
application/single_app/templates/chats.html	Export wizard modal and button integration
application/single_app/templates/_sidebar_nav.html	Export button in sidebar with compact styling
application/single_app/templates/_sidebar_short_nav.html	Export button in short sidebar variant
application/single_app/static/js/chat/chat-export.js	Export wizard module with multi-step UI logic
application/single_app/static/js/chat/chat-conversations.js	Export button integration in main conversations list
application/single_app/static/js/chat/chat-sidebar-conversations.js	Export menu item and button handlers in sidebar
application/single_app/static/css/sidebar.css	Compact button styling for selection mode actions
application/single_app/templates/public_workspaces.html	UNRELATED: Retention policy settings tab
application/single_app/templates/group_workspaces.html	UNRELATED: Retention policy settings tab
application/single_app/static/js/public/public_workspace.js	UNRELATED: Retention policy functions + broken import
application/single_app/config.py	UNRELATED: MIME type registration for fonts
application/single_app/static/images/custom_logo.png	UNRELATED: Custom logo image
application/single_app/static/images/custom_logo_dark.png	UNRELATED: Custom logo dark mode image

[Paul Lizer (paullizer)]

please update release_notes.md with the feature

[eldong]

I updated the release notes to include the Export Conversations and Retention policy UI features.

[Copilot]

Pull request overview

Copilot reviewed 16 out of 18 changed files in this pull request and generated 3 comments.