feat(ui): add session history navigation, permission keys, and review shortcuts

mod+alt+arrows step through this window's session-open history (or between
neighbouring tabs when session tabs are on), mod+k r renames the current
session inline, and mod+k a toggles permission auto-accept. Pending
permission cards respond to alt+enter / alt+shift+enter / alt+backspace with
the keys printed on the buttons. The commit message box commits on
mod+enter, alt+arrows step the diff review between changed files, and the
command palette gains search-only commands for rare actions so the initial
list stays short.

packages/ui/src/lib/sessionTabs.ts

@@ -26,6 +26,28 @@ export const activateSessionTabByIndex = (index: number): boolean => {
   return true;
 };
 
+/**
+ * Activate the tab one step right (+1) or left (-1) of the current session
+ * in the rendered strip order, wrapping around the ends. Returns false when
+ * the current session has no tab or there is nothing to move to.
+ */
+export const activateAdjacentSessionTab = (delta: -1 | 1): boolean => {
+  const { tabIds } = useSessionTabsStore.getState();
+  const { currentSessionId, setCurrentSession } = useSessionUIStore.getState();
+  const sessionsById = new Map(
+    useGlobalSessionsStore.getState().activeSessions.map((session) => [session.id, session] as const),
+  );
+  const renderable = tabIds.filter((id) => sessionsById.has(id));
+  if (!currentSessionId || renderable.length < 2) return false;
+  const index = renderable.indexOf(currentSessionId);
+  if (index === -1) return false;
+  const nextId = renderable[(index + delta + renderable.length) % renderable.length];
+  const next = sessionsById.get(nextId);
+  if (!next) return false;
+  setCurrentSession(next.id, resolveGlobalSessionDirectory(next));
+  return true;
+};
+
 export const closeSessionTabAndActivateNeighbour = (sessionId: string): void => {
   const { tabIds, closeTab } = useSessionTabsStore.getState();
   if (!tabIds.includes(sessionId)) return;