Download codeg 0.21.5

- feat(git): The branch selector moves below the composer, with a rebuilt dropdown. It now mounts per conversation, and its dropdown is a searchable, virtualized list combining git operations with prefix-grouped local and remote branches — each offering switch, merge, rebase, and delete.
- feat(chat): Context usage and connection status move below the composer, per conversation. The context gauge and a color-coded connection heart now sit beneath each composer, so tiled views show their own state.
- feat(acp): Diagnose why an installed agent still reads "not installed." A read-only report checks Node/npm, the npm prefix, your PATH, and each agent's launchability, names the likely cause, and copies it all in one click. Open it from Agent Settings or the composer's not-installed banner.
- feat(chat): Slash commands match by fuzzy subsequence. Typing /bmadhelp or /bmhp now finds bmad-help, across both the chat and automation menus. Thanks to @asxuen (#368).
- feat(chat): Changed files in a reply open on click. Changed-file rows now render as cards that open in the workspace tabs, with a reveal-in-folder button.
- feat(sidebar): The locate-conversation button moves to the sidebar header, beside the view-options funnel.
- fix(chat): A copied URL pastes as its address, not the page title. Links copied from a browser's address bar now keep the URL, while text copied within the editor still round-trips intact.
- fix(kimi): Kimi's context gauge no longer jams at 100%. It now reads occupancy from the latest step instead of summing every step's cached prefix; cumulative token totals are unchanged.
- fix(chat): No more stacked placeholder tool cards while streaming. Empty in-flight polls are skipped until a real id or result arrives.
- fix(acp): Install logs keep non-UTF-8 error text, so localized OS errors (e.g. GBK on Chinese Windows) no longer truncate the log or blank the failure detail.
- fix(acp): The composer catches up when an install is detected, refreshing from "not installed" as soon as the Settings probe records a version.
- fix(sidebar): The Folders section stays visible when nothing is open, showing an empty hint instead of disappearing.