feat: move session sharing and collab rooms into a plugin (B12)

src/ui/shell/TabBar.tsx

@@ -27,10 +27,9 @@ import {
   Minimize2,
   FolderOpen,
   PanelRight,
-  Share2,
 } from "lucide-react";
 import { tabIcon } from "@/shell/tabUtils";
-import { isSessionTabType, isShareableTabType } from "@/shell/tab-registry";
+import { isSessionTabType } from "@/shell/tab-registry";
 import { isElectron } from "@/lib/electron";
 import type { Tab, TabType, SplitMode } from "@/types/ui-types";
 import { SPLIT_MODES, PANE_COUNTS } from "@/lib/theme";
@@ -43,11 +42,6 @@ function isConnectionTab(type: TabType): boolean {
   return isSessionTabType(type);
 }
 
-/** Connection tabs that also offer "Share session". */
-function isShareableConnectionTab(type: TabType): boolean {
-  return isConnectionTab(type) && isShareableTabType(type);
-}
-
 export function TabBar({
   tabs,
   activeTabId,
@@ -63,7 +57,6 @@ export function TabBar({
   onRemoveFromSplit,
   onRenameTab,
   onOpenFileManager,
-  onOpenShare,
   isAppFullscreen,
   onToggleAppFullscreen,
   rightDockOpen,
@@ -84,7 +77,6 @@ export function TabBar({
   onRemoveFromSplit: (tabId: string) => void;
   onRenameTab?: (tabId: string, newLabel: string) => void;
   onOpenFileManager?: (tabId: string) => void;
-  onOpenShare?: (tabId: string) => void;
   isAppFullscreen: boolean;
   onToggleAppFullscreen: () => void;
   rightDockOpen?: boolean;
@@ -472,19 +464,6 @@ export function TabBar({
                         <RefreshCw className="size-3" />
                       </button>
                     )}
-                    {isShareableConnectionTab(tab.type) && onOpenShare && (
-                      <button
-                        onPointerDown={(e) => e.stopPropagation()}
-                        onClick={(e) => {
-                          e.stopPropagation();
-                          onOpenShare(tab.id);
-                        }}
-                        title={t("sessionSharing.shareButton")}
-                        className="flex items-center justify-center size-5 md:size-4 rounded-sm transition-colors text-muted-foreground hover:text-foreground hover:bg-muted"
-                      >
-                        <Share2 className="size-3" />
-                      </button>
-                    )}
                     <button
                       onPointerDown={(e) => e.stopPropagation()}
                       onClick={(e) => {

src/ui/shell/tab-registry.ts

@@ -61,8 +61,6 @@ export interface TabTypeDef {
   persistent?: boolean;
   singleton?: boolean;
   session?: boolean;
-  /** Whether a session tab offers "Share session". Default true. */
-  shareable?: boolean;
   hostless?: boolean;
   restore?: (host: Host) => boolean;
   activityTypes?: string[];
@@ -117,11 +115,6 @@ export function isSessionTabType(type: string): boolean {
   return CORE_SESSION.has(type) || !!registry.get(type)?.session;
 }
 
-/** Whether a session tab of this type offers "Share session". Default true. */
-export function isShareableTabType(type: string): boolean {
-  return registry.get(type)?.shareable !== false;
-}
-
 export function isHostlessTabType(type: string): boolean {
   return CORE_HOSTLESS.has(type) || !!registry.get(type)?.hostless;
 }

src/ui/shell/tabUtils.tsx

@@ -10,7 +10,6 @@ import {
   Fingerprint,
   Hammer,
   ScrollText,
-  Presentation,
 } from "lucide-react";
 import { lazy, Suspense } from "react";
 import { useTranslation } from "react-i18next";
@@ -28,12 +27,6 @@ import {
 } from "@/lib/adaptive-resource-budget";
 
 // Heavy tab surfaces — keep out of the AppShell critical path.
-const CollabRoomTab = lazy(() =>
-  import("@/features/collab/CollabRoomTab").then((m) => ({
-    default: m.CollabRoomTab,
-  })),
-);
-
 const DashboardTab = lazy(() =>
   import("@/dashboard/DashboardTab").then((m) => ({
     default: m.DashboardTab,
@@ -129,8 +122,6 @@ export function tabIcon(type: TabType) {
       return <Settings className="size-3.5" />;
     case "homepage":
       return <LayoutGrid className="size-3.5" />;
-    case "collab":
-      return <Presentation className="size-3.5" />;
     case "termix-id":
       return <Fingerprint className="size-3.5" />;
     case "session-logs":
@@ -231,11 +222,6 @@ export function renderTabContent(tab: Tab, context: TabRenderContext) {
     case "homepage":
       return withTabSuspense(<HomepageCanvas />);
 
-    case "collab":
-      return withTabSuspense(
-        <CollabRoomTab roomId={tab.collabRoomId} isVisible={isVisible} />,
-      );
-
     case "termix-id":
       return withTabSuspense(
         <PanelTabFrame>