Workspace file browser, MCP approvals, LaTeX rendering land

New features

• Added a workspace file browser for previewing files and linking workspace paths into prompts.
• Added a directory picker for choosing a workspace folder when starting a new thread.
• Added controls to expand or collapse all diffs while reviewing changed files.
• Added MCP approval choices for allowing requested actions in the current chat or across chats.
• Added LaTeX rendering in Codex messages and plans.

Improvements and bug fixes

• Improved status indicators for running threads, queued prompts, side chats, and subagents.
• Improved pairing and onboarding with clearer errors, manual pairing-code support, and more reliable host selection after pairing.
• Improved task-list recovery, reconnect state, host-specific refresh, and thread performance.
• Improved Codex profile sharing, activity history, and settings layout.
• Improved goal workflows with a composer shortcut, desktop-aligned goal message actions, and better resumed question handling.
• Improved assistant message actions, transcript layout, and public rate-limit names.
• Fixed stuck thread-list swipe actions, duplicate messages when reopening a new thread, spawned subagents appearing as top-level task rows, and misleading connection errors when sending prompts.