feat(ui): integrate login with shared auth shell

src/test/java/com/lab/labtimesheet/feature/reporting/controller/AccountTemplateIntegrationTest.java

@@ -49,6 +49,20 @@ class AccountTemplateIntegrationTest {
                 .andExpect(content().string(containsString("href=\"/assets/app.css\"")));
     }
 
+    @Test
+    void loginUsesPublicAuthShellAndPreservesAuthenticationContract() throws Exception {
+        mvc.perform(get("/template-contract/accounts/login")
+                        .param("error", "")
+                        .with(user("anonymous-template-viewer")))
+                .andExpect(status().isOk())
+                .andExpect(content().string(containsString("class=\"auth-shell\"")))
+                .andExpect(content().string(containsString("action=\"/login\"")))
+                .andExpect(content().string(containsString("name=\"username\"")))
+                .andExpect(content().string(containsString("autocomplete=\"current-password\"")))
+                .andExpect(content().string(containsString("role=\"alert\"")))
+                .andExpect(content().string(containsString("src=\"/assets/theme.js\"")));
+    }
+
     @Controller
     public static class TemplateController {
 
@@ -62,5 +76,10 @@ class AccountTemplateIntegrationTest {
             model.addAttribute("token", "raw-token");
             return "accounts/activate";
         }
+
+        @GetMapping("/template-contract/accounts/login")
+        String login() {
+            return "accounts/login";
+        }
     }
 }