2.18.0

Added

• Read-only file and diff browsing in the main workspace, with a persistent
  file navigator, labeled sidebar sections, four pinned previews, per-file
  reading positions, and optional source/conversation split on wide terminals.
• Contents and Changes controls with explicit working-tree, staged and latest
  task baselines, plus file search, go-to-line, section paging, copy and reload.
  Narrow terminals use a temporary full-width navigator. Vim motions scroll
  the visible reader when Vim mode is enabled.
• Black sidebar surfaces in dark themes and bold language icons/badges in file,
  search, context and change lists, without requiring a patched terminal font.
• A persistent Sidebar toggle in the header, also available with Ctrl+B.
• Keep the composer visible when files open. A labeled Show / Hide prompt
  button at the top of the file viewer and F4 shortcut toggle it alongside
  an open file, preserving the draft and reading position.
• A wider sidebar resize target with a visible grip and Narrow / Widen buttons
  for adjusting its width without dragging. Resize colors follow the theme.

Fixed

• Keep approval requests, agent questions, and connection setup visible when
  returning from file review, while preserving the task draft.
• Keep sidebar selection, source syntax, code backgrounds and line numbers
  aligned with the active theme, including live theme changes. Recognize more
  source filenames instead of falling back to plain text.
• Parse Git status without dropping filename characters or misclassifying
  unstaged files. Preserve spaces, Unicode and renamed paths; preview untracked
  text files and select the correct change row with mouse or keyboard.
• Ignore stale file/diff loads after another selection or return to Chat.
  Preserve task drafts and transcript reading positions while browsing.
• Bound source loading and preview caches, and defer hidden harness discovery.
  Keep the sidebar opt-in and the existing connection workflow.