v2.1.260

## What's changed - Added a diff panel that opens beside the conversation in fullscreen mode and shows your uncommitted changes as Claude edits; toggle it with `/diff` - Added a likely cause for prompt-cache misses (e.g. tool definitions or system prompt changed, idle past the TTL) to `/cost` and the status line's `prompt_cache` field - Added `/reload-plugins` to headless sessions, so it appears in the Claude Code Desktop and SDK command lists - Added a text form of `/advisor` (`/advisor`, `/advisor `, `/advisor off`) for the desktop app, Remote Control, and other headless (`-p`/Agent SDK) sessions - Added `oidc.scope_on_refresh` to the Claude apps gateway for IdPs that return an id_token on refresh only when asked for `openid` again - Added Claude apps gateway support for newer Claude Desktop keys in `desktop` policy blocks, including `userPluginMarketplacesEnabled` and `userPluginUploadsEnabled` - Fixed `Edit`/`Write`/`Read` permission rules whose path contains parentheses being dropped as invalid or ignored by the Bash sandbox, which left "read-only" folders writable - Fixed one file permission rule with an uncompilable pattern (e.g. an unclosed `[`) making every file edit fail