fix(lite): grow the Network tab scroll region with a Dummy (ImGui layout)

Each server card advanced to the next via a bare SetCursorScreenPos, which ImGui won't use to
extend the scroll region's content height ("Code uses SetCursorPos() to extend window boundaries
... submit an item e.g. Dummy() afterwards"). Beyond the warning, this meant cards past the fold
wouldn't scroll. Advance with an ImGui::Dummy(cardW, gap) below each card so the content height
grows correctly.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ui/windows/network_tab.cpp

@@ -246,7 +246,10 @@ void RenderLiteNetworkTab(App* app)
                     ImVec2(hideMin.x + (hideW - icoSz.x) * 0.5f, cardMin.y + (cardH - icoSz.y) * 0.5f),
                     hideHov ? OnSurface() : OnSurfaceDisabled(), eye);
 
-        ImGui::SetCursorScreenPos(ImVec2(cardMin.x, cardMax.y + gap));
+        // Advance to the next card via a real item (Dummy) below the card, so the scroll region's
+        // content height actually grows — ImGui won't extend bounds from a bare SetCursorScreenPos.
+        ImGui::SetCursorScreenPos(ImVec2(cardMin.x, cardMax.y));
+        ImGui::Dummy(ImVec2(cardW, gap));
     };
 
     // ── Visible servers ────────────────────────────────────────────────────────