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>

web/src/components/Files.tsx

@@ -56,10 +56,16 @@ function icon(e: Entry) {
   return <Icon name="file" className="ficon" />;
 }
 
-export function Files({ onMenu }: { onMenu: () => void }) {
+/** Embedded in a chat tab: own start folder, no page header, folder kept by the caller. */
+export interface FilesEmbed {
+  startDir: string;
+  onDirChange?: (dir: string) => void;
+}
+
+export function Files({ onMenu, embed }: { onMenu?: () => void; embed?: FilesEmbed }) {
   const t = useT();
   const roots = useFetch<{ path: string; name: string }[]>("/fs/roots").data ?? [];
-  const [dir, setDir] = useState<string>(() => localStorage.getItem("codecraft.filesDir") ?? "");
+  const [dir, setDir] = useState<string>(() => embed?.startDir ?? localStorage.getItem("codecraft.filesDir") ?? "");
   const [listing, setListing] = useState<Listing>();
   const [hidden, setHidden] = useState(false);
   const [error, setError] = useState<string>();
@@ -79,7 +85,8 @@ export function Files({ onMenu }: { onMenu: () => void }) {
         const l = await get<Listing>(`/files/list?path=${encodeURIComponent(path)}&hidden=${hidden}`);
         setListing(l);
         setDir(l.path);
-        localStorage.setItem("codecraft.filesDir", l.path);
+        if (embed) embed.onDirChange?.(l.path);
+        else localStorage.setItem("codecraft.filesDir", l.path);
         setError(undefined);
       } catch (e: any) {
         setError(e.message);
@@ -143,7 +150,7 @@ export function Files({ onMenu }: { onMenu: () => void }) {
 
   // "Edit file" links from other pages (e.g. automations) open the file directly.
   useEffect(() => {
-    const target = sessionStorage.getItem("codecraft.openFile");
+    const target = embed ? null : sessionStorage.getItem("codecraft.openFile");
     if (!target) return;
     sessionStorage.removeItem("codecraft.openFile");
     setDir(target.slice(0, target.lastIndexOf("/")) || "/");
@@ -432,12 +439,14 @@ export function Files({ onMenu }: { onMenu: () => void }) {
 
   return (
     <>
-      <div className="topbar">
-        <button className="ghost menu-btn" onClick={onMenu} aria-label={t("nav.menu")}>
-          <Icon name="menu" />
-        </button>
+      <div className={embed ? "files-embed-bar" : "topbar"}>
+        {!embed && (
+          <button className="ghost menu-btn" onClick={onMenu} aria-label={t("nav.menu")}>
+            <Icon name="menu" />
+          </button>
+        )}
         <div className="grow">
-          <h1>{t("nav.files")}</h1>
+          {!embed && <h1>{t("nav.files")}</h1>}
           <div className="path">{listing?.path}</div>
         </div>
         {listing?.repo && (