Refactor project structure in solution

Replaced "EnvelopeGenerator.WebUI" with "EnvelopeGenerator.Server" and "EnvelopeGenerator.WebUI.Client" with "EnvelopeGenerator.Server.Client". Updated project entries, solution configuration platforms, and nested projects to reflect these changes.

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Layout/Header.razor

@@ -0,0 +1,21 @@
+<nav class="navbar header-navbar p-0">
+    <button class="navbar-toggler bg-primary d-block" @onclick="OnToggleClick">
+        <span class="navbar-toggler-icon"></span>
+    </button>
+    <div class="ms-3 fw-bold title pe-4">EnvelopeGenerator.ReceiverUI</div>
+</nav>
+
+@code {
+    [Parameter] public bool ToggleOn { get; set; }
+    [Parameter] public EventCallback<bool> ToggleOnChanged { get; set; }
+
+    async Task OnToggleClick() => await Toggle();
+
+    async Task Toggle(bool? value = null) {
+        var newValue = value ?? !ToggleOn;
+        if(ToggleOn != newValue) {
+            ToggleOn = newValue;
+            await ToggleOnChanged.InvokeAsync(ToggleOn);
+        }
+    }
+}

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Layout/MainLayout.razor

@@ -0,0 +1,27 @@
+@using EnvelopeGenerator.WebUI.Client.Services;
+@inherits LayoutComponentBase
+
+<div class="page">
+<main>
+        <article class="content">
+            @Body
+        </article>
+    </main>
+    <footer class="receiver-footer">
+        <span>&copy; SignFlow 2023-2024 <a href="https://digitaldata.works" target="_blank" rel="noopener">Digital Data GmbH</a></span>
+        <span class="receiver-footer__sep">&#124;</span>
+        <a href="docs/privacy-policy.de-DE.html" target="_blank" rel="noopener">Datenschutz</a>
+    </footer>
+</div>
+
+@code {
+    [Inject] HttpClient Http { get; set; }
+    List<string> RequiredFonts = new() {
+        "opensans.ttf"
+    };
+
+    protected async override Task OnInitializedAsync() {
+        await FontLoader.LoadFonts(Http, RequiredFonts);
+        await base.OnInitializedAsync();
+    }
+}

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Layout/MainLayout.razor.css

@@ -0,0 +1,18 @@
+#blazor-error-ui {
+    background: lightyellow;
+    bottom: 0;
+    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
+    display: none;
+    left: 0;
+    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
+    position: fixed;
+    width: 100%;
+    z-index: 1000;
+}
+
+    #blazor-error-ui .dismiss {
+        cursor: pointer;
+        position: absolute;
+        right: 0.75rem;
+        top: 0.5rem;
+    }

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Layout/NavMenu.razor

@@ -0,0 +1,46 @@
+<div class="top-row ps-3 navbar navbar-dark">
+    <div class="container-fluid">
+        <a class="navbar-brand" href="">EnvelopeGenerator.ReceiverUI</a>
+        <button title="Navigation menu" class="navbar-toggler" @onclick="ToggleNavMenu">
+            <span class="navbar-toggler-icon"></span>
+        </button>
+    </div>
+</div>
+
+<div class="@NavMenuCssClass" @onclick="ToggleNavMenu">
+    <nav class="flex-column">
+        @*
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="" Match="NavLinkMatch.All">
+                <span class="oi oi-home" aria-hidden="true"></span> Home
+            </NavLink>
+        </div>
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="documentviewer">
+                <span class="oi oi-plus" aria-hidden="true"></span> Document Viewer (JS-Based)
+            </NavLink>
+        </div>
+        *@
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="receiver">
+                <span class="oi oi-plus" aria-hidden="true"></span> Empfänger-UI
+            </NavLink>
+        </div>
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="sender">
+                <span class="oi oi-plus" aria-hidden="true"></span> Umschlag-UI
+            </NavLink>
+        </div>
+    </nav>
+</div>
+
+@code {
+    private bool collapseNavMenu = true;
+
+    private string NavMenuCssClass => collapseNavMenu ? "collapse" : null;
+
+    private void ToggleNavMenu()
+    {
+        collapseNavMenu = !collapseNavMenu;
+    }
+}