fix(ui): keep the sidebar server-switcher in sync with the viewed server

Two "current server" notions diverged: the sidebar switcher (session active_server_id)
vs the server-details URL. Now viewing a server's details sets it active (sidebar
always matches the page), and switching the sidebar while on a details page navigates
to the chosen server (instead of reloading the old one). One current server, in sync.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/Livewire/ServerSwitcher.php

@@ -18,7 +18,19 @@ class ServerSwitcher extends Component
 
         session(['active_server_id' => $server->id]);
 
-        $this->redirect($this->safeReturnUrl(), navigate: true);
+        $this->redirect($this->targetFor($server, $this->safeReturnUrl()), navigate: true);
+    }
+
+    /**
+     * Where to land after selecting a server. On a server-details page, switching should
+     * VIEW the chosen server (so the URL, sidebar and scoped context never diverge);
+     * everywhere else just reload the current page so the active context updates.
+     */
+    public function targetFor(Server $server, string $current): string
+    {
+        return preg_match('#^/servers/[^/]+#', $current) === 1
+            ? route('servers.show', $server)
+            : $current;
     }
 
     /**

app/Livewire/Servers/Show.php

@@ -61,6 +61,11 @@ class Show extends Component
      */
     public function mount(): void
     {
+        // Viewing a server's details makes it the ACTIVE server, so the sidebar switcher
+        // (and the server-scoped sections) always reflect the server on screen — no drift
+        // between the URL subject and the sidebar selection.
+        session(['active_server_id' => $this->server->id]);
+
         // identity + gauges render from the persisted row immediately;
         // the live snapshot loads lazily via wire:init -> load().
     }

tests/Feature/ServerContextSyncTest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Livewire\Servers\Show;
+use App\Livewire\ServerSwitcher;
+use App\Models\Server;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Livewire\Livewire;
+use Tests\TestCase;
+
+class ServerContextSyncTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private function server(string $name): Server
+    {
+        return Server::create(['name' => $name, 'ip' => '10.0.0.'.rand(2, 250), 'ssh_port' => 22, 'status' => 'online']);
+    }
+
+    public function test_viewing_server_details_sets_it_active(): void
+    {
+        $this->actingAs(User::factory()->create());
+        $b = $this->server('B');
+
+        Livewire::test(Show::class, ['server' => $b]);
+
+        $this->assertSame($b->id, session('active_server_id'));
+    }
+
+    public function test_switching_on_a_details_page_targets_the_new_server(): void
+    {
+        $a = $this->server('A');
+        $b = $this->server('B');
+        $switcher = new ServerSwitcher;
+
+        // On A's details page, selecting B targets B's details (not a reload of A).
+        $this->assertSame(route('servers.show', $b), $switcher->targetFor($b, '/servers/'.$a->uuid));
+    }
+
+    public function test_switching_elsewhere_keeps_the_current_page(): void
+    {
+        $b = $this->server('B');
+        $switcher = new ServerSwitcher;
+
+        // Off a server-details page, the current page is reloaded as-is.
+        $this->assertSame('/files', $switcher->targetFor($b, '/files'));
+        $this->assertSame('/servers', $switcher->targetFor($b, '/servers')); // fleet list, not a details page
+    }
+}