Add responsive mobile layouts and navigation

src/routes/servers/[name]/+page.svelte

@@ -395,6 +395,8 @@
 
                     {#if netDiagnosis}
                         {#if netDiagnosis.ok && netDiagnosis.results}
+                            <!-- svelte-ignore a11y_no_noninteractive_tabindex (Keyboard users need to scroll the table.) -->
+                            <div class="table-scroll" role="region" aria-label="Network diagnostics" tabindex="0">
                             <table class="net-table">
                                 <thead>
                                     <tr>
@@ -421,6 +423,7 @@
                                     {/each}
                                 </tbody>
                             </table>
+                            </div>
                             {#if netDiagnosis.config}
                                 <div class="net-meta">
                                     KOMODO_ADDRESS = <code>{netDiagnosis.config.komodoAddress ?? '(unset)'}</code>
@@ -607,7 +610,7 @@
     /* Diagnostics KV grid */
     .diag-grid {
         display: grid;
-        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
+        grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr));
         gap: var(--space-2);
         margin-top: var(--space-2);
     }
@@ -714,7 +717,10 @@
     }
 
     /* Network table */
+    .table-scroll { max-width: 100%; overflow-x: auto; }
+    .table-scroll:focus-visible { box-shadow: var(--focus-ring); }
     .net-table {
+        min-width: 600px;
         width: 100%;
         margin-top: var(--space-4);
         border-collapse: separate;
@@ -810,7 +816,8 @@
     .hist-err { color: var(--state-danger); font-size: var(--text-xs); font-family: var(--font-mono); }
 
     @media (max-width: 640px) {
-        .metrics { grid-template-columns: 1fr 1fr; }
+        .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
+        .panel-head, .alert { flex-wrap: wrap; }
         .hist-row {
             grid-template-columns: 1fr;
             gap: var(--space-1);