feat: enhance folder navigation and team section UI

- Implemented synthetic group creation for new folders in `DashboardView`, allowing navigation to projects without existing sessions.
- Added `headerExtra` prop to `CollapsibleTeamSection` for inline elements, improving UI flexibility.
- Updated `TeamDetailView` to include a notification button for the `claude-notifications-go` plugin, enhancing user experience with desktop notifications.

src/renderer/components/dashboard/DashboardView.tsx

@@ -315,11 +315,35 @@ const NewProjectCard = (): React.JSX.Element => {
         return;
       }
 
-      // Still no match — open the folder in file manager as fallback
-      const result = await api.openPath(selectedPath, undefined, true);
-      if (!result.success) {
-        logger.error('Failed to open folder:', result.error);
-      }
+      // Still no match — create a synthetic group for this new folder and navigate to it.
+      // This allows launching teams in projects that don't have Claude sessions yet.
+      const encodedId = selectedPath.replace(/[/\\]/g, '-');
+      const folderName = selectedPath.split('/').filter(Boolean).pop() ?? selectedPath;
+      const now = Date.now();
+
+      const syntheticGroup: RepositoryGroup = {
+        id: encodedId,
+        identity: null,
+        worktrees: [
+          {
+            id: encodedId,
+            path: selectedPath,
+            name: folderName,
+            isMainWorktree: true,
+            source: 'unknown',
+            sessions: [],
+            createdAt: now,
+          },
+        ],
+        name: folderName,
+        mostRecentSession: undefined,
+        totalSessions: 0,
+      };
+
+      useStore.setState((state) => ({
+        repositoryGroups: [syntheticGroup, ...state.repositoryGroups],
+      }));
+      navigateToMatch({ repoId: encodedId, worktreeId: encodedId });
     } catch (error) {
       logger.error('Error selecting folder:', error);
     }

src/renderer/components/team/CollapsibleTeamSection.tsx

@@ -8,6 +8,8 @@ interface CollapsibleTeamSectionProps {
   badge?: string | number;
   /** Secondary badge (e.g. unread count). Shown next to main badge when defined. */
   secondaryBadge?: number;
+  /** Extra element rendered inline after badges (e.g. notification icon). */
+  headerExtra?: React.ReactNode;
   defaultOpen?: boolean;
   forceOpen?: boolean;
   action?: React.ReactNode;
@@ -18,6 +20,7 @@ export const CollapsibleTeamSection = ({
   title,
   badge,
   secondaryBadge,
+  headerExtra,
   defaultOpen = true,
   forceOpen,
   action,
@@ -58,6 +61,7 @@ export const CollapsibleTeamSection = ({
               {secondaryBadge} new
             </Badge>
           )}
+          {headerExtra}
         </div>
         {action && <div className="relative z-10 flex shrink-0 items-center">{action}</div>}
       </div>

src/renderer/components/team/TeamDetailView.tsx

@@ -18,6 +18,7 @@ import { useStore } from '@renderer/store';
 import { buildTaskCountsByOwner } from '@renderer/utils/pathNormalize';
 import { toMessageKey } from '@renderer/utils/teamMessageKey';
 import {
+  Bell,
   CheckCheck,
   GitBranch,
   Pencil,
@@ -832,6 +833,25 @@ export const TeamDetailView = ({ teamName }: TeamDetailViewProps): React.JSX.Ele
         secondaryBadge={
           filteredMessages.length > 0 && messagesUnreadCount > 0 ? messagesUnreadCount : undefined
         }
+        headerExtra={
+          <Tooltip>
+            <TooltipTrigger asChild>
+              <button
+                type="button"
+                className="pointer-events-auto rounded p-0.5 text-[var(--color-text-muted)] transition-colors hover:text-[var(--color-text-secondary)]"
+                onClick={(e) => {
+                  e.stopPropagation();
+                  void window.electronAPI.openExternal(
+                    'https://github.com/777genius/claude-notifications-go'
+                  );
+                }}
+              >
+                <Bell size={12} />
+              </button>
+            </TooltipTrigger>
+            <TooltipContent side="top">Desktop notifications plugin</TooltipContent>
+          </Tooltip>
+        }
         defaultOpen
         action={
           <div className="flex items-center gap-2 pl-2">