feat: add search/album/genre filtering and /albums + /genres browse pages

DeepDrftPublic.Client/Pages/TracksView.razor

@@ -5,6 +5,41 @@
 
 <div>
     <div class="tracks-view-container">
+        @* Search + filter affordances are interactive-only: the debounce timer and pill clear
+           need WASM. During prerender/non-interactive they are hidden, matching the view-mode
+           toggle's interactivity gate. *@
+        @if (RendererInfo.IsInteractive)
+        {
+            <div class="tracks-search-row">
+                <MudTextField T="string"
+                              Value="@ViewModel.SearchText"
+                              ValueChanged="@OnSearchInput"
+                              Immediate="true"
+                              DebounceInterval="400"
+                              Placeholder="Search tracks, artists, albums"
+                              Adornment="Adornment.Start"
+                              AdornmentIcon="@Icons.Material.Filled.Search"
+                              Variant="Variant.Outlined"
+                              Margin="Margin.Dense"
+                              Clearable="true"
+                              Class="tracks-search-field"/>
+            </div>
+
+            @if (ViewModel.FilterAlbum is not null || ViewModel.FilterGenre is not null)
+            {
+                <div class="tracks-filter-pills">
+                    <MudChip T="string"
+                             Color="Color.Tertiary"
+                             Variant="Variant.Filled"
+                             OnClose="@(_ => ClearFilter())">
+                        @(ViewModel.FilterAlbum is not null
+                            ? $"Album: {ViewModel.FilterAlbum}"
+                            : $"Genre: {ViewModel.FilterGenre}")
+                    </MudChip>
+                </div>
+            }
+        }
+
         @if (ViewModel.Page != null)
         {
             <div class="tracks-view-header">