fix: auto-expand sidebar when a project is selected

When the sidebar is collapsed and the user clicks a project, the session
list was silently updated behind the hidden panel with no visual feedback,
leaving the user confused about why nothing appeared to change.

Fixed by setting sidebarCollapsed: false in both selectProject and
selectRepository at the moment of selection. Both entry points are covered:
- selectRepository: used by the dashboard project cards
- selectProject: used by the command palette and keyboard shortcuts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/renderer/store/slices/projectSlice.ts

@@ -59,6 +59,7 @@ export const createProjectSlice: StateCreator<AppState, [], [], ProjectSlice> =
   selectProject: (id: string) => {
     set({
       selectedProjectId: id,
+      sidebarCollapsed: false, // Ensure session list is visible when a project is selected
       ...getSessionResetState(),
     });
 

src/renderer/store/slices/repositorySlice.ts

@@ -87,6 +87,7 @@ export const createRepositorySlice: StateCreator<AppState, [], [], RepositorySli
         selectedWorktreeId: worktreeToSelect.id,
         selectedProjectId: worktreeToSelect.id,
         activeProjectId: worktreeToSelect.id,
+        sidebarCollapsed: false, // Ensure session list is visible when a project is selected
         ...getSessionResetState(),
       });
       // Fetch sessions for this worktree