Chat tabs, chat mode, own modes, compaction notice, CLI binaries again

- Terminals and file managers as tabs of a chat; chat terminals keep running on
  the server (no idle timeout) and re-attach from any device
- "Just chat" in New session and a built-in chat mode with a lean prompt and only
  web tools; custom modes with kind (coding/conversation), read-only and tool picker
- Mode selector as a dropdown
- The chat shows running compactions (automatic: tokens and share of the limit)
  and labels summaries
- Docker image builds and serves the terminal client binaries again
- Fix: atomic session updates; background title/usage writes no longer undo each
  other (auto compaction triggered one turn late)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,13 +7,37 @@ until 1.0, minor versions may contain breaking changes.
 
 ### Added
 
+- The Docker image ships the terminal client again (static Linux x86_64 and aarch64 binaries):
+  `curl -fsSL https://<your-server>/cli/install.sh | sh`, download links in the settings and
+  `codecraft update` work without building from source.
 - File manager: *Open chat here* in a folder's menu starts a chat in that folder.
+- **Tabs in a chat:** open terminals and file managers next to the chat (topbar buttons or
+  "+" in the tab strip), as many as needed. Terminals of a chat keep running on the server until
+  they are closed, so they are there again after a reload or on another device (output is
+  replayed); they end when the chat is deleted or the server restarts.
+- **Chat mode:** *New session → Just chat* (and mode `chat`) for plain conversation – a lean
+  prompt with date and personal memory, web search and fetch only, no project or files.
+- **Own modes:** *Settings → Agents & commands → New mode* with kind (coding or conversation),
+  read-only switch, tool checkboxes, prompt, model and review loop; custom modes show up in
+  *New session* and the mode selector.
+- The chat shows when the conversation is being compacted – automatically because the context
+  is nearly full (with tokens and share of the limit) or on request – and labels the summary.
+
+### Changed
+
+- The mode selector in the composer is a dropdown.
 
 ### Removed
 
 - *Settings → Config file* no longer offers to move `${NAME}` values into the configuration (a
   one-time migration); `${NAME}` references keep working.
 
+### Fixed
+
+- Session updates from background tasks (title, token usage, phase, todos) and from the UI
+  no longer overwrite each other. Often the first answer's token usage was lost, so automatic
+  compaction and the context display started one turn late.
+
 ## [v202611-00002] – 2026-11-09
 
 ### Added