May 4th Release

This release covers everything since v0.58.14: live kanban peek transcripts, Claude Code 2.1.x session import, theme contributions from extensions, AI chat undo/redo, granular diffs, and security hardening of mcp.

New Features

• Live kanban peek transcripts. Hover a running session card and watch the transcript stream in real time instead of waiting for the turn to finish.
• Extension-contributed themes. Extensions can register themes via contributions.themes. They appear in Settings > Themes under "Extension Themes" and in the gutter theme popup, with a graceful fallback when an extension is disabled.
• Spawn sibling AI sessions. Agents can launch sibling sessions via /launch-new-session, sharing files-edited, tabs, and workstream overview with the parent.
• Full undo/redo for AI chat input. Cmd+Z / Cmd+Shift+Z restore the complete state -- text, attachments, cursor, and prompt history navigation -- across image pastes, large-text pastes, drag-drops, mention insertions, and force-pastes.
• Diff peek in Agent mode. Hover-revealed peek icon on Files Edited rows opens an inline unified diff popover anchored to the row.
• File history dialog in Agent mode. Cmd+Y now opens history for the active file in Agent mode, not just Files mode.
• xhigh** effort level for Claude Code.** Matches the CLI's full five-level slider (low / medium / high / xhigh / max).

Improvements

• Streaming transcripts coalesce live. Streaming assistant messages now merge into a single canonical event as tokens arrive, so the kanban peek shows real recent context instead of just the last few tokens of long turns.
• Security hardening. Improved internal MCP with local token auth
• CVE patches. Updated lodash-es for a security advisory.
• Auto-naming sessions is more reliable. Extra check for agent session naming and tagging, so sessions land on the kanban board with the right metadata even when the agent doesn't volunteer it.

Fixed

• Concurrent tab edits no longer clobber each other. Built-in editor saves route through diff resolution so an edit in one tab no longer silently overwrites concurrent changes in another.
• Granular AI diffs. Word-by-word LCS-based diffs no longer flash entire bullets or paragraphs as red+green when only a small span actually changed; pure-formatting changes mark only the re-formatted span.
• Table diffs show row add/remove and in-cell content changes. Modified cells show the original content as removed and the new content as added, instead of silently overwriting.
• Reduced renderer freeze on long Claude Code streams. Transcripts re-render at most once per animation frame regardless of token rate, helping reduce multi-minute hangs and OOM on long sessions.
• Custom Claude Installation override is now per-workspace. Project values no longer leak into the User scope or other projects.
• Worktree workspaces inherit Claude path overrides from their parent project.
• Codex ACP stays stable on longer sessions. Bounded the stderr buffer so multi-hour sessions no longer crash the main process with OOM.
• Git status reads no longer wait 15+ seconds. Read-only git:status and git:working-changes skip the index lock that was queueing behind concurrent writes.
• File tree refreshes for gitignored folders when an agent creates temp/, nimbalyst-local/, or similar paths.
• OpenCode receives paste attachments. Pasted text and images now actually reach the model instead of showing up as phantom @filename references.
• Multi-file Codex ACP *apply_patch** tracks every file*, not just the first.
• Context menus stop flashing at 0,0 before positioning.
• Workstream UI refreshes when a sibling session spawns -- no manual toggle.
• Workstream and worktree kanban peeks show the child session's transcript instead of "No messages yet."
• Custom editors load for compound file extensions like *.reddit.watch.json.
• Workspace-relative paths resolve in the workspace:open-file IPC, fixing the git diff peek "Open in editor" link.
• Duplicate rows collapse in the Files Edited tree. Relative and absolute paths for the same file now dedup correctly.
• Cross-timezone date comparisons work correctly across TIMESTAMPTZ stores.
• OpenCode installation instructions now correctly points at opencode-ai.