Persist and restore selected project and environment across page reloads

- Add refreshOrganization/refreshProject/refreshEnvironment to context store — update value and localStorage without clearing child selections
- OrgSelector: use refreshOrganization when same org is already stored, preventing the chain that was clearing project and environment
- ProjectSelector: watch org ID (not object ref) so refresh doesn't retrigger; add autoSelectProject to restore stored project or auto-select single project
- EnvironmentTabBar: watch project ID; skip env-clear on initial mount; add autoSelectEnvironment to restore stored env or fall back to first
- Fix test fixtures missing isPrimary field; update EnvironmentTabBar tests to match v-select implementation; add tests for restore behavior

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

src/admin/tests/unit/views/ProfileView.spec.ts

@@ -44,7 +44,7 @@ describe('ProfileView', () => {
     it('ThenOrgNameIsDisplayedWhenSelected', () => {
       const { wrapper } = mountView();
       const contextStore = useContextStore();
-      contextStore.setOrganization({ id: 1, name: 'Acme Corp', createdAt: '' });
+      contextStore.setOrganization({ id: 1, name: 'Acme Corp', createdAt: '', isPrimary: false });
 
       expect(wrapper.find('[data-testid="profile-org-name"]').exists()).toBe(false); // org name shown in v-if block
     });