refactor: every count in the web app is said by one plural(), with the viewer's thousands separator; a source guard names any hand-written copy (M505 #5642)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/lib/components/NetworkSettingsCard.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+  import { plural } from '#lib/utils/plural.js';
   import { onMount } from 'svelte';
   import {
     getNetworkSettings,
@@ -84,9 +85,8 @@
     </SettingRow>
     {#if suggested > 0 && settings.trusted_proxy_hops !== suggested}
       <p class="px-4 py-3 text-sm text-text-primary">
-        This request arrived with {suggested}
-        {suggested === 1 ? 'forwarded address' : 'forwarded addresses'}, so {suggested}
-        {suggested === 1 ? 'proxy is' : 'proxies are'} likely.
+        This request arrived with {plural(suggested, 'forwarded address', 'forwarded addresses')}, so
+        {plural(suggested, 'proxy is', 'proxies are')} likely.
       </p>
     {/if}
     <!-- Verification, not decoration: "the address Minstrel sees for you"