feat(frontend): show workspace name in sidebar (#1150)

## Summary
- Displays the current workspace name next to the "< Workspaces"
back-link in the sidebar
- Users can always see which workspace they are in without navigating
away

## Test plan
- [ ] Run `make kind-up LOCAL_IMAGES=true`
- [ ] Run `make dev-env` to generate `.env.local` with token
- [ ] Run `make dev COMPONENT=frontend` and navigate to a workspace
- [ ] Verify workspace name appears on the Workspaces nav line
- [ ] Verify long names are truncated with tooltip on hover
- [ ] Verify clicking the link still navigates back to workspace list

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: patjlm

components/frontend/src/app/projects/[name]/sessions/[sessionName]/components/sessions-sidebar.tsx

@@ -265,10 +265,15 @@ export function SessionsSidebar({
           <Button
             variant="ghost"
             size="sm"
-            className="w-full justify-start text-muted-foreground hover:text-foreground"
+            className="w-full justify-between text-muted-foreground hover:text-foreground"
           >
-            <ChevronLeft className="w-4 h-4 mr-2" />
-            Workspaces
+            <span className="flex items-center">
+              <ChevronLeft className="w-4 h-4 mr-2" />
+              Workspaces
+            </span>
+            <span className="text-xs font-semibold text-foreground truncate max-w-[60%]" title={projectName}>
+              {projectName}
+            </span>
           </Button>
         </Link>