feat(FN-2398): restore compact project switch in tablet header

- Render the compact project switch trigger for tablet layouts by gating on compact mode instead of mobile-only mode
- Extend ProjectSelector compact-switch styles to the tablet media range so the trigger and dropdown render correctly beside the logo
- Update tablet header control regression coverage to expect the compact switch affordance and absence of the desktop selector trigger
- Add Header tablet interaction tests covering Escape key, outside click, and project selection closing behavior for the compact switch dropdown

packages/dashboard/app/components/ProjectSelector.css

@@ -273,8 +273,8 @@
   color: var(--todo);
 }
 
-/* Mobile styles for mobile-project-switch */
-@media (max-width: 768px) {
+/* Compact styles for mobile-project-switch (mobile + tablet) */
+@media (max-width: 768px), (min-width: 769px) and (max-width: 1024px) {
   .mobile-project-switch {
     display: inline-flex;
     align-items: center;