fix: enable strict mode, honest HTTP boundary, and add routing

Three fixes to the parts of the template that contradicted its own
"illegal states unrepresentable" claim:

- tsconfig: turn on strict + strictTemplates (measured zero fallout —
  the codebase already typechecked cleanly, it just wasn't enforced).
- RemoteData<T> drops its unused error type parameter (Resource.error
  is always Error) and Failure now carries a real Error. Pages read the
  union with @let instead of re-deriving from the resource, which
  deletes the non-null assertion strictNullChecks would otherwise flag.
- users.adapter.ts never checked response.ok, so an HTTP error resolved
  as a garbage Success and crashed instead of reaching RemoteData's
  Failure branch. New shared/infrastructure/http.ts adds the status
  check plus hand-written parse guards and abortSignal forwarding; the
  six fetch stubs across the test suite (which encoded the missing
  check) and adapter spec now cover the Failure and Empty paths.

Also adds real routing (@angular/router was a dependency with zero
imports and a fake "Back" button): /users and /users/:id are now
deep-linkable via withComponentInputBinding(), tested with
RouterTestingHarness driving real navigation.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/users/ui/users.page.ts

@@ -1,4 +1,5 @@
-import { Component, computed, signal } from '@angular/core';
+import { Component, computed, inject, input } from '@angular/core';
+import { Router } from '@angular/router';
 import { PageShellComponent } from '@shared/ui/templates/page-shell.component';
 import { AsyncComponent } from '@shared/ui/molecules/async.component';
 import { fromResource } from '@shared/application/remote-data';
@@ -13,11 +14,12 @@ import { isEmptyUserList } from '@users/domain/user';
   template: `
     <app-page-shell heading="Users">
       @if (selectedUserId(); as id) {
-        <app-user-detail [userId]="id" (close)="selectedUserId.set(null)" />
+        <app-user-detail [userId]="id" (close)="router.navigate(['/users'])" />
       } @else {
-        <app-async [data]="listData()" (retry)="usersResource.reload()">
-          @if (usersResource.hasValue()) {
-            <app-user-list [users]="usersResource.value()!" (select)="selectedUserId.set($event)" />
+        @let list = listData();
+        <app-async [data]="list" (retry)="usersResource.reload()">
+          @if (list.tag === 'Success' && list.value) {
+            <app-user-list [users]="list.value" (select)="router.navigate(['/users', $event])" />
           }
         </app-async>
       }
@@ -25,7 +27,12 @@ import { isEmptyUserList } from '@users/domain/user';
   `,
 })
 export class UsersPage {
-  protected selectedUserId = signal<number | null>(null);
+  protected router = inject(Router);
+  userId = input<string>();
+  protected selectedUserId = computed(() => {
+    const id = this.userId();
+    return id ? Number(id) : null;
+  });
   protected usersResource = usersResource();
   protected listData = computed(() => fromResource(this.usersResource, isEmptyUserList));
 }