v0.18.0

Added

• The pull request badge keeps up with the session working next to it. A
  commit — or the push that opens a pull request — now reaches the badge, the
  checks and the diff on its own, instead of waiting for you to click away to
  another window and back. Git status also follows a checkout that is being
  worked in every second rather than every three, settling back to the slower
  cadence once it goes quiet, so nothing extra is spent on idle projects.

• Open, review and merge pull requests without leaving lich. A branch's
  GitHub pull request now opens as a full-screen view — reached from the footer
  PR badge, a session card's #N, or a session's "Pull request" menu — that
  parks a card in the worktree's sidebar group beside its session, the way the
  Settings screen does. The Overview tab renders the description as markdown
  alongside the checks and mergeability; the Checks tab lists every check —
  what failed first, what is still running and for how long — and opens its run
  in the browser, refreshing itself every ten seconds while any of them is still
  going; the Files changed tab shows the whole
  diff next to a file tree that jumps to a file on click — hide the tree and
  the diff takes the whole width — folds every file at once when the review
  gets wide, and lets you tick each one off as viewed: the file folds away and
  the header counts how far you are. Merge from the header
  — squash, a merge commit or rebase, editing the commit message first if you
  want — and the merge offers to remove the branch's worktree once it lands, or
  open a pull request when the branch has none. A reload button covers what
  nothing can announce (a review, a check going green). It reuses the gh CLI
  already behind the footer badge, so a repo without gh or a non-GitHub remote
  simply shows nothing.

• The footer shows the active session's model and context window. The status
  strip now names the model the active Claude session runs and its reasoning
  effort (e.g. opus 4.8 · xhigh), marked with the provider's icon, and a small
  ring beside it fills with the percent of its context window in use; hovering
  the ring shows a fuller bar and the exact tokens against the window size. It
  refreshes as the context grows through a turn, read off the conversation's
  transcript. The ring turns amber past 80% and red past 95%, so a session
  drifting toward auto-compaction is visible without opening /context. The
  percent is taken against the model's native window (1M for current
  Opus/Sonnet/Fable, 200k for Haiku). The readout can be turned off under
  Settings › Providers › Claude Code. Needs no change to the user's statusline;
  other providers stay blank until they report a session id of their own.

• The file tree tracks the working tree live. The Files tab now lists
  untracked-but-not-ignored files alongside tracked ones and drops any file
  deleted from disk, so a file created or removed during a session shows up
  without a commit — it is no longer frozen at the session's starting set.

• The file tree shows each changed file's line delta. A modified or new
  file carries the same +added −deleted pair the review panel and footer use,
  reusing the diff already parsed for the review — a clean file stays bare.

• Right-click in the file tree. A directory's context menu offers Expand all
  and Collapse all over that folder's subtree; a file's offers Open in editor. A
  GUI $VISUAL/$EDITOR — or the platform opener (xdg-open, open -t,
  start) when neither is set — launches detached; a terminal editor (vim,
  nvim, nano, …) opens in a fresh lich terminal session rooted at the checkout,
  since a detached launch would leave it with no controlling terminal. The
  editor is resolved from the login shell, so a GUI launch still sees rc exports.