Fix view-tab reactivity using direct onclick binding

- Change view-tabs from delegateEvent to direct onclick like hst-frontend
- Remove hardcoded 'active' class from grid tab in HTML
- Update active class immediately on click before state update
- Update proxy target to tzrtech.org

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

deck-frontend/index.html

@@ -63,7 +63,7 @@
         <span id="sel-count"></span>
       </div>
       <div class="view-tabs">
-        <button class="view-tab active" data-view="grid">Grid</button>
+        <button class="view-tab" data-view="grid">Grid</button>
         <button class="view-tab" data-view="tree">Tree</button>
         <button class="view-tab" data-view="graph">Graph</button>
       </div>